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affinity has 3 distinct synonyms spread across 3 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is consanguinity.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
(immunology) the attraction between an antigen and an antibody
(anthropology) kinship by marriage or adoption; not a blood relationship
Synonyms, antonyms and the broader and narrower relations for affinity come from Princeton University’s WordNet. Full sources and licences.
(biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts
“in anatomical structure prehistoric man shows close affinity with modern humans”
the force attracting atoms to each other and binding them together in a molecule
“basic dyes have an affinity for wool and silk”
inherent resemblance between persons or things
a natural attraction or feeling of kinship
“an affinity for politics”