Main Entry: 1com·ple·ment
Pronunciation: 'käm-pl&-m&nt
Function: noun
Etymology: Middle English, from Latin complementum, from complEre to fill up, complete, from com- + plEre to fill -- more at FULL
1 a : something that fills up, completes , or makes perfect b : the quantity or number required to make a thing complete <the usual complement of eyes and ears -- : one of two mutually completing parts : COUNTERPART