adjective . 1. additional or further: he and one other person. 2. different or distinct from the one mentioned or implied: in some other city; Some other design may be better.

Definition of other from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games.

adjective. being the remaining one or ones of two or more Bill and the other boys; different or distinct from that or those referred to or implied use your other foot, not Jane but ...

other adj. Being the remaining one of two or more: the other ear. Being the remaining ones of several: His other books are still in storage

It is this step that makes the definition recursive. All other things are excluded from the set; For instance, we could define natural number as follows (after Peano)