Elegant variation is a writer's substitution of "one word for another for the sake of variety". The term was introduced in 1906 by H. W. Fowler and F. G. Fowler in The King's English. In their meaning of the term, they focus particularly on instances when the word being avoided is a noun or its pronoun. Pronouns are themselves differences intended to avoid awkward repetition, and deviations are so often necessary, that they should be used only when needed. The Fowlers recommend that "variations should take place only when there is some awkwardness, such as ambiguity or noticeable monotony, in the word avoided".