1. [noun] the force attracting atoms to each other and binding them together in a molecule; "basic dyes have an affinity for wool and silk"
    Synonyms: chemical attraction

  2. [noun] (immunology) the attraction between an antigen and an antibody

  3. [noun] kinship by marriage or adoption; not a blood relationship
    Synonyms: kinship by marriage

  4. [noun] (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"
    Synonyms: phylogenetic relation

  5. [noun] a close connection marked by community of interests or similarity in nature or character; "found a natural affinity with the immigrants"; "felt a deep kinship with the other students"; "anthropology's kinship with the humanities"
    Synonyms: kinship

  6. [noun] inherent resemblance between persons or things

  7. [noun] a natural attraction or feeling of kinship; "an affinity for politics"; "the mysterious affinity between them"; "James's affinity with Sam"


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