Etymology

Adjective

1. Opposite in effect or nature or order
2. reverse, opposite in or order
3. Having the properties of an inverse.
4. (Kiowa-Tanaon linguistics) A grammatical number marking that indicates the opposite grammatical number (or numbers) of the default number specification of noun class.

Noun

1. The opposite of a given, due to contrary nature or effect.

   Deposing is the opposite of installing, and vice versa

2. The reverse version of a procedure.

   Removing one's shoes is the inverse of putting one's shoes on

3. The inverse of an element x with respect to a binary operation is an element that when combined with x yields the appropriate identity element.

   The additive inverse of x is -x as, x + -x = 0 where 0 is the additive identity element.

   The multiplicative inverse of x is x^-1 as, x * x^-1 = 1 where 1 is the multiplicative identity element.

   The compositional inverse of a function f is f^–1 as, f f^–1 is the identity function (ie f^–1(f(a)) = a for all a).

4. A statement constructed from the negatives of the premise and conclusion of some other statement: ~p → ~q is the inverse of p → q.

Verb

1. To compute the bearing and distance between two points.