If

Part of speech: conjunction (conj.)

1. In case that; granting, allowing, or supposing that; -- introducing a condition or supposition. Tisiphone, that oft hast heard my prayer, Assist, if OEdipus deserve thy care. Pope. If thou be the Son of God, command that these stones be made bread. Matt. iv. 3.

2. Whether; -- in dependent questions. Uncertain if by augury or chance. Dryden. She doubts if two and two make four. Prior. As if, But if. See under As, But.