complementarily Definition

1. Serving as a complement to something.

Thesaurus: companion, correlative, corresponding, interrelated, interdependent, reciprocal, interwoven, matched.
2. Said of two or more things: complementing each other.
3. physics.
Denoting either of a pair of coloured lights that, when mixed together in the correct intensities, produce the sensation of white light.

There is often a spelling confusion between complementary and complimentary.