o'clock

Meanings

1. 1
   adv

   Used with a number to say the exact hour of the day.

   The meeting starts at nine o'clock tomorrow morning.

2. 2
   adv

   Used with a number to describe a direction, as if from the centre of a clock face.

   The plane appeared at three o'clock, off to our right.

Shortened form of "of the clock", from Middle English of the clokke [from late 14th c.].

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