1. : a number that is one more than three see Table of Numbers. 2. : the fourth in a set or series. the four of hearts. 3. : something having four units or members: such as. a. : a 4-oared racing shell or its crew. b. : a 4-cylinder engine or automobile. four adjective. four pronoun, plural in construction. Examples of four in a Sentence. More @Wikipedia
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