LATIN DICTIONARYLexicon Latīnum
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“affinity” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

affinity
affinitas. To make affinity with (Bible, Tr.), affinitatem cum aliquo conjungere; cum aliquo affinitate sese conjungere, sese devincire. Relations by affinity, affines: affinitate conjuncti. To be connected by affinity, affinitate inter se jungi, devinciri.
Close connection, similarity, cognatio, conjunctio. To have an affinity with anything, cognationem habere cum aliqua re; propinquum, finitimum, propinquum et finitimum esse alicui rei: there is some affinity between our souls and the gods, animus tenetur quadam conjunctione deorum: not to bear the least affinity to anything, remotissimum esse a re.
Power of attracting, *attrahendi, quae dicitur, vis (propr.): *vis ad se illiciendi or attrahendi (IMPROP.).

Quick answer

What is the Latin word for affinity?
The usual Latin words for “affinity” are affīnitās, cognātiō, coniūnctiō; also attrahō, volō, affīnis. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.