Definition of affine in English:

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Pronunciation: /əˈfīn/ Pronunciation: /ˈafīn/


Allowing for or preserving parallel relationships.
Example sentences
  • Using parallelograms to define affine transformations may be a mixed blessing.
  • Our interest is in the space of affine equivalence classes of equal-area polygons.
  • The simplest way to see why this assertion is true is to observe that any triangle in the plane can be mapped by an invertible affine transformation to an equilateral triangle.


A relative by marriage.
Example sentences
  • They were sisters, mothers, daughters, affines, rather than simply women in groups.
  • Finally the ‘deceased wife's sister’ law was belatedly reformed in 1906, although marriage between such affines as adoptive parents and children, and adoptive siblings, remained within the prohibited degrees.
  • When a dying person breathes his/her last breath, close relatives, normally affines, wash and put new clothes on the body.


Early 16th century (as a noun): from Old French afin or Latin affinis 'related' (see affinity). The mathematical sense dates from the early 20th century.

For editors and proofreaders

Syllabification: af·fine

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