Definition of Open

1. Noun. A clear or unobstructed space or expanse of land or water. "Finally broke out of the forest into the open"

Exact synonyms: Clear
Generic synonyms: Area, Country
Derivative terms: Clear, Clear, Clear, Clear

2. Verb. Cause to open or to become open. "They want to open the doors"; "Mary opened the car door"
Exact synonyms: Open Up
Specialized synonyms: Unbar, Break Open, Click Open, Reopen, Unlock, Unbolt, Unseal, Uncork, Jimmy, Lever, Prise, Prize, Pry, Breach, Gap, Lance
Causes: Open Up
Antonyms: Close
Derivative terms: Opener, Opener, Opening, Opening

3. Adjective. Affording unobstructed entrance and exit; not shut or closed. "They left the door open"
Exact synonyms: Unfastened
Similar to: Ajar, Wide-open
Antonyms: Shut

4. Noun. Where the air is unconfined. "Camping in the open"
Exact synonyms: Open Air, Out-of-doors, Outdoors
Generic synonyms: Exterior, Outside
Derivative terms: Outdoorsy

5. Verb. Start to operate or function or cause to start operating or functioning. "The business is going to open "; "Open a business"
Exact synonyms: Open Up
Specialized synonyms: Establish, Found, Launch, Set Up
Antonyms: Close
Derivative terms: Opening, Opening

6. Adjective. Affording free passage or access. "Open ranks"
Also: Unfastened, Unsealed
Similar to: Opened, Unstoppered, Yawning
Antonyms: Closed

7. Noun. A tournament in which both professionals and amateurs may play.
Generic synonyms: Tournament, Tourney

8. Verb. Become open. "The doors open "; "The door opened"
Exact synonyms: Open Up
Generic synonyms: Change State, Turn
Specialized synonyms: Unfasten, Fly Open
Antonyms: Close
Derivative terms: Opening

9. Adjective. With no protection or shield. "An open wound"
Exact synonyms: Exposed
Similar to: Unprotected

10. Noun. Information that has become public. "The facts had been brought to the surface"
Exact synonyms: Surface
Generic synonyms: General Knowledge, Public Knowledge
Derivative terms: Surface

11. Verb. Begin or set in action, of meetings, speeches, recitals, etc.. "He opened the meeting with a long speech"
Generic synonyms: Commence, Embark On, Start, Start Up
Specialized synonyms: Inaugurate, Call To Order
Antonyms: Close
Also: Open Up
Derivative terms: Opener, Opening, Opening

12. Adjective. Open to or in view of all. "An open letter to the editor"
Similar to: Public

13. Verb. Spread out or open from a closed or folded state. "Spread your arms"
Exact synonyms: Spread, Spread Out, Unfold
Generic synonyms: Undo
Specialized synonyms: Divaricate, Exfoliate, Grass, Butterfly, Uncross, Splay
Derivative terms: Opening
Antonyms: Fold

14. Adjective. Used of mouth or eyes. "His mouth slightly opened"
Exact synonyms: Opened
Similar to: Agape, Gaping, Agaze, Staring, Wide, Wide-eyed, Yawning
Antonyms: Closed

15. Verb. Make available. "This opens up new possibilities"
Exact synonyms: Open Up
Causes: Open Up
Generic synonyms: Afford, Give, Yield
Derivative terms: Opening

16. Adjective. Not having been filled. "The job is still open"
Similar to: Available

17. Verb. Become available. "An opportunity opened up"
Exact synonyms: Open Up
Generic synonyms: Arise, Come Up
Derivative terms: Opening

18. Adjective. Accessible to all. "An open economy"
Similar to: Unrestricted

19. Verb. Have an opening or passage or outlet. "The bedrooms open into the hall"
Derivative terms: Opening, Opening, Opening

20. Adjective. Not defended or capable of being defended. "Open to attack"
Exact synonyms: Assailable, Undefendable, Undefended
Similar to: Vulnerable
Derivative terms: Assail, Assailability

21. Verb. Make the opening move. "Kasparov opened with a standard opening"
Category relationships: Chess, Chess Game
Generic synonyms: Go, Move
Derivative terms: Opening

22. Adjective. (of textures) full of small openings or gaps. "A loose weave"
Exact synonyms: Loose
Similar to: Coarse, Harsh

23. Verb. Afford access to. "The French doors give onto a terrace"
Exact synonyms: Afford, Give
Derivative terms: Opening

24. Adjective. Having no protecting cover or enclosure. "Open sports cars"
Similar to: Unenclosed

25. Verb. Display the contents of a file or start an application as on a computer.
Generic synonyms: Display, Exhibit, Expose
Antonyms: Close

26. Adjective. (set theory) of an interval that contains neither of its endpoints.
Category relationships: Math, Mathematics, Maths
Antonyms: Closed

27. Adjective. Not brought to a conclusion; subject to further thought. "Our lawsuit is still undetermined"
Exact synonyms: Undecided, Undetermined, Unresolved
Similar to: Unsettled

28. Adjective. Not sealed or having been unsealed. "The opened package lay on the table"
Exact synonyms: Opened
Similar to: Unsealed

29. Adjective. Without undue constriction as from e.g. tenseness or inhibition. "Her natural and open response"
Similar to: Unconstricted
Derivative terms: Openness

30. Adjective. Ready or willing to receive favorably. "Receptive to the proposals"

31. Adjective. Open and observable; not secret or hidden. "Open ballots"
Exact synonyms: Overt
Also: Explicit, Expressed, Public, Unconcealed
Similar to: Bald, Barefaced, Naked, Raw, Undisguised, Visible
Derivative terms: Openness
Antonyms: Covert

32. Adjective. Not requiring union membership. "An open shop employs nonunion workers"
Similar to: Nonunion

33. Adjective. Possibly accepting or permitting. "The time is fixed by the director and players and therefore subject to much variation"
Exact synonyms: Capable, Subject
Similar to: Susceptible
Derivative terms: Capability

34. Adjective. Affording free passage or view. "The open countryside"
Exact synonyms: Clear
Similar to: Unobstructed
Derivative terms: Clarity, Clear, Openness

35. Adjective. Openly straightforward and direct without reserve or secretiveness. "A heart-to-heart talk"
Exact synonyms: Candid, Heart-to-heart
Similar to: Artless, Ingenuous
Derivative terms: Candidness, Heart-to-heart, Openness

36. Adjective. Ready for business. "The stores are open"
Similar to: Active

Definition of Open

1. a. Free of access; not shut up; not closed; affording unobstructed ingress or egress; not impeding or preventing passage; not locked up or covered over; -- applied to passageways; as, an open door, window, road, etc.; also, to inclosed structures or objects; as, open houses, boxes, baskets, bottles, etc.; also, to means of communication or approach by water or land; as, an open harbor or roadstead.

2. n. Open or unobstructed space; clear land, without trees or obstructions; open ocean; open water.

3. v. t. To make or set open; to render free of access; to unclose; to unbar; to unlock; to remove any fastening or covering from; as, to open a door; to open a box; to open a room; to open a letter.

4. v. i. To unclose; to form a hole, breach, or gap; to be unclosed; to be parted.

Definition of Open

1. Adjective. (not comparable) Which is not closed; accessible; unimpeded; as, an open gate. ¹

2. Adjective. (not comparable) Actively conducting or prepared to conduct business. ¹

3. Adjective. (comparable) Receptive. ¹

4. Adjective. (not comparable) Public; as, an open letter, an open declaration. ¹

5. Adjective. (not comparable) Candid, ingenuous, not subtle in character: ¹

6. Adjective. (mathematics logic of a formula) Having a free variable. ¹

7. Adjective. (mathematics topology of a set) Is part of a predefined collection of subsets of X, that defines a topological space on X. ¹

8. Adjective. (computing not comparable of a file, document, etc.) In current use; mapped to part of memory. ¹

9. Adjective. (business) Not fulfilled. ¹

10. Adjective. (music stringed instruments) without any fingers pressing the string against the fingerboard ¹

11. Verb. (transitive) To make something accessible or removing an obstacle to something being accessible. ¹

12. Verb. (transitive) To bring up (a topic). ¹

13. Verb. (transitive) To make accessible to customers or clients. ¹

14. Verb. (transitive) To start (a campaign). ¹

15. Verb. (intransitive) To become open. ¹

16. Verb. (intransitive) To begin conducting business. ¹

17. Verb. (intransitive cricket) To begin a side's innings as one of the first two batsmen. ¹

18. Verb. (intransitive poker) To bet before any other player has in a particular betting round in a game of poker. ¹

19. Verb. (context: transitive intransitive poker) To reveal one's hand. ¹

20. Verb. (computing transitive intransitive of a file, document, etc.) To load into memory for viewing or editing. ¹

21. Noun. A sports event in which anybody can contest; as, the Australian Open. ¹

22. Noun. (electronics) a wire that is broken midway. ¹

23. Noun. (''with the'') Open or unobstructed space; an exposed location. ¹

24. Noun. (''with the'') Public knowledge or scrutiny; full view. ¹

¹ Source:

Definition of Open

1. affording unobstructed access, passage, or view [adj OPENER, OPENEST] / to cause to become open [v -ED, -ING, -S] : OPENABLE [adj]

Medical Definition of Open

1. Open or unobstructed space; clear land, without trees or obstructions; open ocean; open water. "To sail into the open." "Then we got into the open." (W. Black) In open, in full view; without concealment; openly. 1. Free of access; not shut up; not closed; affording unobstructed ingress or egress; not impeding or preventing passage; not locked up or covered over; applied to passageways; as, an open door, window, road, etc.; also, to inclosed structures or objects; as, open houses, boxes, baskets, bottles, etc.; also, to means of communication or approach by water or land; as, an open harbor or roadstead. "Through the gate, Wide open and unquarded, Satan passed." (Milton) Also, figuratively, used of the ways of communication of the mind, as by the senses; ready to hear, see, etc.; as, to keep one's eyes and ears open. "His ears are open unto their cry." (Ps. Xxxiv. 15) 2. Free to be used, enjoyed, visited, or the like; not private; public; unrestricted in use; as, an open library, museum, court, or other assembly; liable to the approach, trespass, or attack of any one; unprotected; exposed. "If Demetrius . . . Have a matter against any man, the law is open and there are deputies." (Acts xix. 33) "The service that I truly did his life, Hath left me open to all injuries." (Shak) 3. Free or cleared of obstruction to progress or to view; accessible; as, an open tract; the open sea. 4. Not drawn together, closed, or contracted; extended; expanded; as, an open hand; open arms; an open flower; an open prospect. "Each, with open arms, embraced her chosen knight." (Dryden) 5. Hence: Without reserve or false pretense; sincere; characterised by sincerity; unfeigned; frank; also, generous; liberal; bounteous; applied to personal appearance, or character, and to the expression of thought and feeling, etc. "With aspect open, shall erect his head." (Pope) "The Moor is of a free and open nature." (Shak) "The French are always open, familiar, and talkative." (Addison) Not concealed or secret; not hidden or disguised; exposed to view or to knowledge; revealed; apparent; as, open schemes or plans; open shame or guilt. "His thefts are too open." (Shak) "That I may find him, and with secret gaze Or open admiration him behold." (Milton) 6. Not of a quality to prevent communication, as by closing water ways, blocking roads, etc.; hence, not frosty or inclement; mild; used of the weather or the climate; as, an open season; an open winter. 7. Not settled or adjusted; not decided or determined; not closed or withdrawn from consideration; as, an open account; an open question; to keep an offer or opportunity open. 8. Free; disengaged; unappropriated; as, to keep a day open for any purpose; to be open for an engagement. 9. Uttered with a relatively wide opening of the articulating organs; said of vowels; as, the an far is open as compared with the a in say. Uttered, as a consonant, with the oral passage simply narrowed without closure, as in uttering s. 10. Not closed or stopped with the finger; said of the string of an instrument, as of a violin, when it is allowed to vibrate throughout its whole length. Produced by an open string; as, an open tone. The open air, the air out of doors. Open chain. See Closed chain, under Chain. Open circuit, a roof of which the constructional parts, together with the under side of the covering, or its lining, are treated ornamentally, and left to form the ceiling of an apartment below, as in a church, a public hall, and the like. Open vowel or consonant. See Open. Open is used in many compounds, most of which are self-explaining; as, open-breasted, open-minded. Synonym: Unclosed, uncovered, unprotected, exposed, plain, apparent, obvious, evident, public, unreserved, frank, sincere, undissembling, artless. See Candid, and Ingenuous. Origin: AS. Open; akin to D. Open, OS. Opan, G. Offan, Icel. Opinn, Sw. Oppen, Dan. Aaben, and perh. To E. Up. Cf. Up, and Ope. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Open

open (current term)
open-air market
open-air marketplace
open-angle glaucoma
open-closed principle

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