Affinity

af-fin′i-ti, n. nearne of kin, agreement, or resemblance: causal relationship: structural resemblance between languages of ultimately common origin: structural resemblance between plants, animals, or minerals pointing to identity of stock: relationship by marriage, opposed to consanguinity or relationship by blood: ( B. ) social relationship: the spiritual relationship between sponsors and their godchild: a mysterious attraction supposed to exist between two persons: ( chem. ) the peculiar attraction between the atoms of two simple substances that makes them combine to form a compound.— adj. Affin′itive . [Fr.—L. aff in it as — affinis , neighbouring— ad , at, finis , boundary.]