o'clock
verb
°After a numeral, designates the time when the minute hand of a clock or watch points to twelve (as opposed to a certain number of minutes before or after that time) and the hour hand points to the specified numeral.
°After a numeral, designates the relative heading, from a given point and heading, to another point, as if the given point is at the centre of a clock and the numeral twelve is aligned with the given heading.