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.

the process by which two nitrogenous bases in nucleic acid molecules bond to each other

to match two things to form a pair; to mate animals for breeding