1. (n.) That which is analogous to, or corresponds with, some other thing.

2. (n.) A word in one language corresponding with one in another; an analogous term; as, the Latin pater is the analogue of the English father.

3. (n.) An organ which is equivalent in its functions to a different organ in another species or group, or even in the same group; as, the gill of a fish is the analogue of a lung in a quadruped, although the two are not of like structural relations.

4. (n.) A species in one genus or group having its characters parallel, one by one, with those of another group.

5. (n.) A species or genus in one country closely related to a species of the same genus, or a genus of the same group, in another: such species are often called representative species, and such genera, representative genera.

ally alter ego analogon associate brother close copy close match cognate companion complement congenator congener coordinate correlate correlative correspondent counterpart each other equivalent fellow image kindred spirit like likeness match mate near duplicate obverse one another parallel pendant picture reciprocal reciprocatist reciprocator second self similitude simulacrum sister soul mate such suchlike tally the like of the likes of twin