To cite means to mention or quote something as evidence or support for what you're saying. When you write a research paper and cite a book, you're telling readers exactly where you found your information. Scientists cite other scientists' research to show their work builds on solid foundations. In a debate, you might cite statistics or historical facts to strengthen your argument.

Citing means giving credit to the original source and showing you've done your homework. When a lawyer cites a previous court case, she's using it as proof that her argument follows established legal principles. When your teacher asks you to cite your sources, she wants to see the books, websites, or articles you used so she (and your readers) can verify your facts and explore the topics further.

The word can also mean to officially recognize someone, usually for doing something wrong or something brave. A police officer might cite a driver for speeding, which means issuing a ticket. A soldier might be cited for bravery, meaning officially commended for courageous action. A citation is the act of citing something, whether it's a reference in a paper or an official notice.