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affinity 
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 - (immunology) the attraction between an antigen and an antibody
- kinship by marriage or adoption; not a blood relationship
Synonyms: kinship by marriage Antonyms: consanguinity, blood kinship, cognation - (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 - 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 - inherent resemblance between persons or things
- 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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