Definition of If:

part of speech: conjunction

A word which introduces a conditional clause; supposing; provided.

Usage examples:

• " And if That's all I want of you!" William Dean Howells in "A Hazard of New Fortunes, Part Fifth".

• If I do not the works of My Father, believe Me not. Marcus Dods in "The Expositor's Bible: The Gospel of St. John, Vol. I".

• Will you reward me if I recover it? Charles Weathers Bump in "The Mermaid of Druid Lake and Other Stories".

• If only you were free! Marie Belloc Lowndes in "Jane Oglander".