in·separable I. \(ˈ)in, ən+\adjective Etymology: Middle English, from Latin inseparabilis, from in- in- (I) + separabilis separable 1.: not separable : incapable of being separated or disjoined 2.: invariably attached to a word, stem, or root < un- is an inseparable prefix > • in·separableness\“+\noun • in·separably\“+\adverb II. noun (-s) : one that is inseparable from another — usually used in plural