<p><strong>Conjunction</strong></p><ul><li>in case that; granting or supposing that; on condition that: Sing if you want to.</li><li>Stay indoors if it rains.</li><li>I'll go if you do.</li><li>even though: an enthusiastic if small audience.</li><li>whether: He asked if I knew Spanish.</li><li>(used to introduce an exclamatory phrase): If only Dad could see me now!</li><li>when or whenever: If it was raining, we had to play inside.</li></ul><p><strong>Noun</strong></p><ul><li>a supposition; uncertain possibility: The future is full of ifs.</li><li>a condition, requirement, or stipulation: There are too many ifs in his agreement.</li></ul>