affine

noun

af·fine | \ a-ˈfīn ,

ə- \

Definition of affine

(Entry 1 of 2)

: a relative by marriage : in-law

affine

adjective

Definition of affine (Entry 2 of 2)

: of, relating to, or being a transformation (such as a translation, a rotation, or a uniform stretching) that carries straight lines into straight lines and parallel lines into parallel lines but may alter distance between points and angles between lines affine geometry

History and Etymology for affine

Noun

borrowed from Anglo-French affin, going back to Latin affīnis "neighbor, relation by marriage," noun derivative of affīnis "bordering (on), related by marriage" — more at affinity

Adjective

borrowed from New Latin affīnis, taken to mean "having affinity," going back to Latin, "bordering (on), connected (with)" — more at affinity

Noun

Middle French affin, from Latin affinis, from affinis related, from ad to + finis end, border

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