Definition of Illegitimate

1. Noun. The illegitimate offspring of unmarried parents.

Exact synonyms: Bastard, By-blow, Illegitimate Child, Love Child, Whoreson
Generic synonyms: Issue, Offspring, Progeny
Derivative terms: Bastardise, Bastardize, Bastardly

2. Adjective. Contrary to or forbidden by law. "Unlawful measures"
Exact synonyms: Illicit, Outlaw, Outlawed, Unlawful
Similar to: Illegal
Derivative terms: Illicitness, Outlaw, Unlawfulness

3. Adjective. Of marriages and offspring; not recognized as lawful.

Definition of Illegitimate

1. a. Not according to law; not regular or authorized; unlawful; improper.

2. v. t. To render illegitimate; to declare or prove to be born out of wedlock; to bastardize; to illegitimatize.

Definition of Illegitimate

1. Adjective. Illegal; against the law. ¹

2. Adjective. Born to unmarried parents. ¹

3. Adjective. Illogical; incorrectly deduced. ¹

¹ Source:

Definition of Illegitimate

1. [adj]

Medical Definition of Illegitimate

1. 1. Not according to law; not regular or authorised; unlawful; improper. 2. Unlawfully begotten; born out of wedlock; bastard; as, an illegitimate child. 3. Not legitimately deduced or inferred; illogical; as, an illegitimate inference. 4. Not authorised by good usage; not genuine; spurious; as, an illegitimate word. 5. Illegitimate fertilization, or Illegitimate union, the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers. (11 Mar 1998)

Illegitimate Pictures

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Lexicographical Neighbors of Illegitimate

illegitimate (current term)
illegitimate child
illegitimate enterprise

Literary usage of Illegitimate

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Catholic Encyclopedia: An International Work of Reference on the by Charles George Herbermann, Edward Aloysius Pace, Condé Bénoist Pallen, Thomas Joseph Shahan, John Joseph Wynne (1913)
"But in the sixth book of the Decretals all persons of illegitimate birth are ... Pope Urban II (1088-99) prohibited the ordination of the illegitimate ..."

2. A Treatise on the Law of the Domestic Relations: Embracing Husband and Wife by James Schouler (1895)
"Bequests, &o., to illegitimate Children. — Bequests to illegitimate children, since they are not considered as relatives, are not favored in English law. ..."

3. The Social Welfare Forum: Official Proceedings ... Annual Forum by National Conference on Social Welfare, American Social Science Association, Conference of Charities (U.S., Conference of Charities (U.S.), National Conference of Social Work (U.S. (1919)
"We eliminated the word bastard from our Minnesota laws and wanted to eliminate the words illegitimate children, but in the brief time at the disposal of our ..."

4. The Law of Baron and Femme: Of Parent and Child, Guardian and Ward, Master by Tapping Reeve, Amasa Junius Parker, Charles E. Baldwin (1882)
"CHILDREN are legitimate, or illegitimate, (a) A legitimate child is denned to be ... An illegitimate child is defined to be one born out of lawful wedlock. ..."

5. A Treatise on Wills by Thomas Jarman, Melville Madison Bigelow (1881)
"I. illegitimate children, born at the time of the making of the will, ... it is clear that illegitimate children were the intended objects of the testator's ..."

6. International Law: A Treatise by Lassa Oppenheim (1906)
"Now, illegitimate acts and omissions can be committed by belligerent ... Experience teaches that on the whole illegitimate acts and omissions of some kind ..."

7. The diplomatic protection of citizens abroad or the law of international claims by Edwin Montefiore Borchard (1915)
"illegitimate Children. An illegitimate child born in this country is a citizen.4 If born abroad to an American mother and an alien father it seems that the ..."

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