Variation

Variation (Latin variare " change " ), the spontaneous or deliberate alteration of information sequences or properties:

Variation ( music) a composition that introduces a topic in succession through a variety of melodic, harmonic and rhythmic variations
Variations, a linguistic variation of a motif
Variation ( linguistics), which is dependent on four environmental conditions change language level regarding grammar, lexicology, morphology, etc.
Variation ( navigation), the deviation between the geographic and magnetic north direction
Phenotypic Variation ( biology): the differences between individuals occurring in a population.
Variation ( astronomy), a special fault the path of an astronomical object around a central body.
In mathematics:

Variation ( mathematics), a measure of the variation of a function
Variation ( combinatorics ), an ordered selection, arrangement of elements considering the order
Variation (statistics), the statistical spread of values
An approach for extremal functions, see the calculus of variations