English

intervariable

From inter- + variable.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Latin varius ‘different, various’

Latin variare ‘to change’

Old French variable

Today it means

adj Between variables.

Language periods are conventional ranges, not dates for this word.

Etymograph / intervariable