Merriam-Webster Collegiate Dictionary - cue

 I. noun  Etymology: Middle English cu half a farthing (spelled form of q, abbreviation for Latin quadrans quarter of an as)  Date: circa 1755 the letter q  II. noun  Etymology: probably from qu, abbreviation (used as a direction in actors' copies of plays) of Latin quando when  Date: 1553  1.  a. a signal (as a word, phrase, or bit of stage business) to a performer to begin a specific speech or action  b. something serving a comparable purpose ; hint  2. a feature indicating the nature of something perceived  3. archaic the part one has to perform in or as if in a play  4. archaic mood, humor  III. transitive verb  (~d; cuing or ~ing)  Date: 1922  1. to give a ~ to ; prompt  2. to insert into a continuous performance ~ in sound effects  IV. noun  Etymology: French queue, literally, tail, from Old French ~, coe, queue, from Latin cauda  Date: circa 1749  1.  a. a leather-tipped tapering rod for striking the ~ ball (as in billiards and pool)  b. a long-handled instrument with a concave head for shoving disks in shuffleboard  2. queue 2  V. verb  (~d; cuing or ~ing)  Date: circa 1784  transitive verb  1. queue  2. to strike with a ~  intransitive verb  1. queue  2. to use a ~