1. To negate or offset something. A noun or pronoun can be used between "cancel" and "out." My husband and I support different political parties, which means that his vote always cancels out mine.

2. To remove or erase something. A noun or pronoun can be used between "cancel" and "out." We just ran out of the crab special, so be sure to cancel it out on the menu.

3. To remove equal factors from a mathematical equation. A noun or pronoun can be used between "cancel" and "out." Once you cancel out those two numbers, what total are you left with?

4. slang To kill someone. A noun or pronoun can be used between "cancel" and "out." Ray canceled out the informant, just as the boss told him to.

5. To cease one's involvement in something. We can't cancel out now—everyone is relying on us!