- 1[singular] affinity (for/with somebody/something) affinity (between A and B) a strong feeling that you understand someone or something and like them or it synonym rapport Sam was born in the country and had a deep affinity with nature. Humans have a special affinity for dolphins.
- 2[uncountable, countable] affinity (with somebody/something) affinity (between A and B) a close relationship between two people or things that have similar qualities, structures, or features There is a close affinity between Spanish and Portuguese.
NAmE//əˈfɪnət̮i//(pl. affinities) (formal)