Complementary
Part of speech: adjective
Definition: acting as a complement of the specific pairings of the bases in DNA and RNA
Example sentence: Twitter is the ultimate service for the mobile age - its simplification and constraint of the publishing medium to 140 characters is perfectly complementary to a mobile experience. People still need longer stuff, but they see the headline on Twitter or Facebook.
Antonymous
Part of speech: adjective
Definition: having an opposite or diametrically opposed meaningof, or being an antonym