from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. Of or according to the clock: three o'clock.
- adv. According to an imaginary clock dial with the observer at the center and 12 o'clock considered as straight ahead in horizontal position or straight up in vertical position. Used to indicate relative position: enemy planes at 10 o'clock.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In conjunction with a numeral, indicates the time within a twelve hour period (midnight to noon or noon to midnight), specifically the time when the hour hand of a clock points precisely to the symbol or marking corresponding to the designated numeral.
- adv. In conjunction with a term representing an action or event that occurs daily, indicates the time that said action or event occurs, or first occurs.
- adv. In conjunction with a numeral, indicates the direction, relative to the speaker, corresponding to the direction the hour hand is pointing at the time corresponding to the numeral, with twelve representing directly ahead and three being to the right.
- adv. Used to indicate direction on a plane, often vertical with 12 o'clock being straight up, representing a projection of the speaker’s field of vision.
from The Century Dictionary and Cyclopedia
- n. See clock.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. according to the clock
Short for of the clock.(American Heritage® Dictionary of the English Language, Fourth Edition)
Shortened form of “of the clock” or “on the clock”; that is, “according to the clock”. (Wiktionary)