Definitions
1.AdverbNATO, ICAO, ITU & IMO radiotelephony code word used with numerals up to twelve to indicate direction
2.AdverbIn 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, i.e., at the hour."We are expected to be there at six o'clock in the morning!; It is two o'clock.; What o'clock is it?"
3.AdverbUsed to indicate that it is time to do a specific action, or time for a specific action to occur."I'm feeling peckish; I think it must be nearly dinner o'clock.; We're here at Waffle House, and it's waffles o'clock!; Hooray! Beer o'clock!"
4.AdverbIn conjunction with a numeral, indicates the direction, relative to the speaker or a vehicle, especially an aircraft, corresponding to the direction the hour hand is pointing at the time corresponding to the numeral, with twelve representing directly ahead on a horizontal plane, or directly up on a vertical plane, and three being to the right on either.