Add Yahoo as a preferred source to see more of our stories on Google. People say it every day without thinking ― “two o’clock,” “six o’clock,” “eight o’clock sharp.” But what is the purpose of that ...

O'clock is a way of telling the exact hour on a clock. We say "o'clock" when the minute hand (the long hand) points to the number 12 on the clock. When the minute hand points straight up to 12, it ...