what-if noun 2verb 1what if adverb 3forms 3 noun2 •(informal) A speculation as to what might have happened if something else had happened earlier.Each man was running over the what ifs in his mind. — 2005 •(informal) A hypothetical case or situation, usually evoked by a sense of anxiety or uncertainty. verb1 •(informal) To speculate about the consequences of something that could have happened. what if adverb3 •Used to introduce a speculation about a future event.What if we could learn to get along? What would happen then? •Used to introduce a speculation about a past event. Often the basis for counterfactual historical interpretations.What if Abraham Lincoln had not been assassinated? How might the Reconstruction of the Southern States have been handled? •Used to introduce a suggestion or proposal for a future event.What if we arrange it for 9:00 instead of 10:00? formswhat-iffed · what-iffing · what-ifs