isomorphism (n.)

A property of two or more STRUCTURES whose CONSTITUENT parts are in a one-to-one correspondence with each other, at a given level of abstraction. For example, a SYNTACTIC and a SEMANTIC analysis would be isomorphic if for each syntactic UNIT there were a corresponding semantic unit, e.g. SUBJECT+VERB+OBJECT: ACTOR+action+goal. Likewise, a structural isomorphism may occur between LANGUAGES or DIALECTS, e.g. in VOCABULARY (the kinship terms in language X may be isomorphic with those in language Y).