1. Diacyl derivatives of ammonia or primary amines, especially those cyclic compounds derived from diacids. NOC Rule C-827. E.g. 
2. In additive nomenclature, in which imide is analogous to oxide, the term is used to name compounds of the type R3Y+-N-R (Y = N, P) and R2Z+-N-R (Z = O, S, Se, Te), which are the products of formal attachment of an RN= group to N, P, O, S, Se, Te. E.g. amine imides, azomethine imides.
3. Salts having the anion RN2-. RNRI Rule RC-83.1.2.1.
