adj.
1.acting as or providing a complement (something that completes the whole)
2.of words or propositions so related that each is the negation of the other
3.of or relating to or suggestive of complementation complementary n.
1.either one of two chromatic colors that when mixed together give white (in the case of lights) or gray (in the case of pigments)
Idiom of the Day
back-to-back
something follows immediately after something else, two people touching backs
There were two back-to-back games today because of the rain last week. We sat back-to-back during the contest.