Pronunciation: (kôl'out"), [key]
1. an act or instance of calling out.
2. an order to report for emergency or special work, esp. at an unusual time or place.
3. a letter, number, or other device for identifying or calling attention to a particular part of an illustration.
4. a challenge to a duel.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.