affinity
noun
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(immunology) the attraction between an antigen and an antibody
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a close connection marked by community of interests or similarity in nature or character“found a natural affinity with the immigrants”kinship
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in biology, state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts“In anatomical structure, prehistoric hominids show close affinity with modern humans.”
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(anthropology) kinship by marriage or adoption
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a natural attraction or feeling of kinship“an affinity for politics”
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inherent resemblance between persons or things
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the force attracting atoms to each other and binding them together in a molecule“basic dyes have an affinity for wool and silk”chemical attraction