n. 25B6; noun
business partners : COLLEAGUE, associate, co-worker, fellow worker, collaborator, comrade, teammate; Brit. informal oppo; Austral./NZ informal offsider; archaic compeer.
his partner in crime : ACCOMPLICE, confederate, accessory, collaborator, fellow conspirator, helper; informal sidekick.
your relationship with your partner : SPOUSE, husband, wife, consort; lover, girlfriend, boyfriend, fiancé, fiancée, significant other, live-in lover, common-law husband/wife, man, woman, mate; informal hubby, missus, old man, old lady/woman, better half, intended, POSSLQ; Brit. informal other half.