# Invariant

[in-vair-ee-uh nt] /ɪnˈvɛər i ənt/

**adjective**

1.

unvarying; ; constant.

2.

Mathematics. (def 5e).

**noun**

3.

Mathematics. a quantity or expression that is constant throughout a certain range of conditions.

/ɪnˈvɛərɪənt/

**noun**

1.

(maths) an entity, quantity, etc, that is unaltered by a particular transformation of coordinates: a point in space, rather than its coordinates, is an invariant

**adjective**

2.

(maths) (of a relationship or a property of a function, configuration, or equation) unaltered by a particular transformation of coordinates

3.

a rare word for invariable

**adj.**

1851, from in- (1) “not” + variant.

programming

A rule, such as the ordering of an ordered list or heap, that applies throughout the life of a data structure or procedure. Each change to the data structure must maintain the correctness of the invariant.

(1996-03-12)

Tagged: i

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