<p><strong>Noun:</strong></p><ul><li>an apparatus for conveying information by means of visual signals, as a light whose position may be changed.</li><li>any of various devices for signaling by changing the position of a light, flag, etc.</li><li>a system of signaling, especially a system by which a special flag is held in each hand and various positions of the arms indicate specific letters, numbers, etc.</li></ul><p><strong>Verb:</strong></p><ul><li>(used with or without object) semaphored, semaphoring. to signal by semaphore or by some system of flags.</li></ul>