Affinity \Af*fin"i*ty\, n.; pl. Affinities. [OF. afinit['e], F. affinit['e], L. affinites, fr. affinis. See Affined.]

1. 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.

Solomon made affinity with Pharaoh. --1 Kings iii. 1.

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

There is a close affinity between imposture and credulity. --Sir G. C. Lewis.

2. Companionship; acquaintance. [Obs.]

About forty years past, I began a happy affinity with William Cranmer. --Burton.

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

5. (Nat. Hist.) A relation between species or highe? groups dependent on resemblance in the whole plan of structure, and indicating community of origin.

6. (Spiritualism) 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.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Attraction \At*trac"tion\, n. [L. attractio: cf. F. attraction.]

1. (Physics) An invisible power in a body by which it draws anything to itself; the power in nature acting mutually between bodies or ultimate particles, tending to draw them together, or to produce their cohesion or combination, and conversely resisting separation.

Note: Attraction is exerted at both sensible and insensible distances, and is variously denominated according to its qualities or phenomena. Under attraction at sensible distances, there are, -- (1.)

Attraction of gravitation, which acts at all distances throughout the universe, with a force proportional directly to the product of the masses of the bodies and inversely to the square of their distances apart. (2.)

Magnetic, diamagnetic, and electrical attraction, each of which is limited in its sensible range and is polar in its action, a property dependent on the quality or condition of matter, and not on its quantity. Under attraction at insensible distances, there are, -- (1.)

Adhesive attraction, attraction between surfaces of sensible extent, or by the medium of an intervening substance. (2.)

Cohesive attraction, attraction between ultimate particles, whether like or unlike, and causing simply an aggregation or a union of those particles, as in the absorption of gases by charcoal, or of oxygen by spongy platinum, or the process of solidification or crystallization. The power in adhesive attraction is strictly the same as that of cohesion. (3.)

Capillary attraction, attraction causing a liquid to rise, in capillary tubes or interstices, above its level outside, as in very small glass tubes, or a sponge, or any porous substance, when one end is inserted in the liquid. It is a special case of cohesive attraction. (4.)

Chemical attraction, or

affinity, that peculiar force which causes elementary atoms, or groups of atoms, to unite to form molecules.

2. The act or property of attracting; the effect of the power or operation of attraction. --Newton.

3. The power or act of alluring, drawing to, inviting, or engaging; an attractive quality; as, the attraction of beauty or eloquence.

4. That which attracts; an attractive object or feature.

Syn: Allurement; enticement; charm.

Source: Webster's Revised Unabridged Dictionary (1913)