1. (n.) Relationship by marriage (as between a husband and his wife's blood relations, or between a wife and her husband's blood relations); -- in contradistinction to consanguinity, or relationship by blood; -- followed by with, to, or between.

2. (n.) Kinship generally; close agreement; relation; conformity; resemblance; connection; as, the affinity of sounds, of colors, or of languages.

3. (n.) Companionship; acquaintance.

4. (n.) That attraction which takes place, at an insensible distance, between the heterogeneous particles of bodies, and unites them to form chemical compounds; chemistry; chemical or elective affinity or attraction.

5. (n.) A relation between species or higher/ groups dependent on resemblance in the whole plan of structure, and indicating community of origin.

6. (n.) A superior spiritual relationship or attraction held to exist sometimes between persons, esp. persons of the opposite sex; also, the man or woman who exerts such psychical or spiritual attraction.

a thing for accord accordance addition adduction adjunct affairs affiliation agape agreement alikeness alliance allurement amity analogy approximation aptitude aptness assemblage assent association attractance attraction attractiveness attractivity bag bent bias bond bonds of harmony brotherly love capillarity capillary attraction caritas cast cement of friendship centripetal force charity chorus chosen kind chumminess closeness coherence coincidence combination communion community community of interests comparison compatibility conatus concert concord concordance conduciveness conformance conformation conformity congeneracy congeniality congruence congruency congruity connateness connaturality connaturalness connature connectedness connection consistency consonance consort contiguity contrariety cooperation correspondence cup of tea dealings deduction delight diathesis disjunction disposition drag draw druthers eagerness empathy equivalence esprit esprit de corps familiarity family connection family favor family likeness fancy fascination favor feeling for feeling of identity fellow feeling fellowship filiation fondness frictionlessness friendliness generic resemblance good vibes good vibrations gravitation gravity happy family harmony homology identity inclination inseparableness intercourse intersection intimacy intimate acquaintance junction kinship leaning liability liaison like-mindedness liking link linkage linking love magnetism marital affinity marriage connection marriage relationship mateyness mutual affinity mutual attraction mutuality nearness oneness overlap palliness parallelism partiality particular choice peace penchant personal choice predilection predisposition preference prejudice prepossession probability proclivity proneness propensity propinquity proximity pull pulling power rapport rapprochement readiness reciprocity relatedness relation relations relationship resemblance self-consistency semblance sensitivity to sharing similarity simile similitude soft spot solidarity special affinity style susceptibility symmetry sympathy symphony sync synchronism tally taste team spirit tendency thing tie tie-in timing traction tropism tug turn twist type understanding uniformity union unison unisonance unity warp weakness willingness