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Definition of In theory
1. Adverb. With regard to fundamentals although not concerning details. "In principle, we agree" 
Definition of In theory
1. Prepositional phrase. Theoretically. ¹
¹ Source: wiktionary.com
|  | 
1. Adverb. With regard to fundamentals although not concerning details. "In principle, we agree" 
1. Prepositional phrase. Theoretically. ¹
¹ Source: wiktionary.com