(transitive) To change with time or a similar parameter. (transitive) To make of different kinds; to make different from one another; to diversity; to variegate. ...

What is the verb of variation?

vary. (transitive) To change with time or a similar parameter. (transitive) To institute a change in, from a current state; to modify. (intransitive) Not to remain constant: to change with time or a similar parameter.

Is Variating a word?

Yes, variating is in the scrabble dictionary.