Colors located opposite each other on a color wheel which, when mixed as pigments, produce a neutral gray or black tone

In linguistics, a relationship where two speech sounds or elements occur in different environments and do not overlap

one of two angles that together sum to 180 degrees

The process where chemical bases on opposite strands of DNA or RNA bond with one another, such as [[腺嘌呤|腺嘌呤|xian4 piao4 ling4]] pairing with [[胸腺嘧啶|胸腺嘧啶|xiong1 xian4 mi4 ding4]] in DNA.