affine

[a-fahyn, uh-fahyn, af-ahyn]
noun
1.
a person related to one by marriage.
adjective Mathematics.
2.
assigning finite values to finite quantities.
3.
of or pertaining to a transformation that maps parallel lines to parallel lines and finite points to finite points.

Origin:
1500–10; < French affin related < Latin affinis akin, neighboring

affinely, adverb
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World English Dictionary
affine (ˈæfaɪn)
 
adj
maths of, characterizing, or involving transformations which preserve collinearity, esp in classical geometry, those of translation, rotation and reflection in an axis
 
[C16: via French from Latin affīnis bordering on, related]

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Affine term structure models exploit these restrictions.
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