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The Collaborative International Dictionary of English v.0.48 (gcide)

Affinity \Af*fin"i*ty\, n.; pl. {Affinities}. [OF. afinit['e],
F. affinit['e], L. affinites, fr. affinis. See {Affined}.]
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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.
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Solomon made affinity with Pharaoh. --1 Kings iii.
1.
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2. Kinship generally; close agreement; relation; conformity;
resemblance; connection; as, the affinity of sounds, of
colors, or of languages.
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There is a close affinity between imposture and
credulity. --Sir G. C.
Lewis.
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2. Companionship; acquaintance. [Obs.]
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About forty years past, I began a happy affinity
with William Cranmer. --Burton.
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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.
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5. (Nat. Hist.) A relation between species or higher groups
dependent on resemblance in the whole plan of structure,
and indicating community of origin.
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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.
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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.
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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.
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2. The act or property of attracting; the effect of the power
or operation of attraction. --Newton.
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3. The power or act of alluring, drawing to, inviting, or
engaging; an attractive quality; as, the attraction of
beauty or eloquence.
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4. That which attracts; an attractive object or feature.
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Syn: Allurement; enticement; charm.
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