1. the coordination by conjunction of linguistic units of the same status;
2. a conjunction (like `and' or `or') that connects two identically constructed grammatical constituents;
WordNet (r) 3.0 (2006):
coordinating conjunction
n 1: the coordination by conjunction of linguistic units of the
same status
2: a conjunction (like `and' or `or') that connects two
identically constructed grammatical constituents