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In general, affinity = attraction

In chemistry:

The force attracting atoms to each other and binding them together in a molecule.

e.g "basic dyes have an affinity for wool and silk"

In Biology:

(Biology) state of relationship between organisms or groups of organisms resulting in resemblance in structure or structural parts

e.g. "in anatomical structure prehistoric man shows close affinity with modern humans"

In anthropology:

Kinship by marriage or adoption; not a blood relationship

In immunology:

The attraction between an antigen and an antibody

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14y ago

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