Quicknews
Apr 24, 2026

What Does the “O” in “O’Clock” Mean?

English is full of quirks that native speakers often take for granted.

Words that look like they should rhyme, like come and home or through and cough, don’t.

Others, like tear and tear or wound and wound, are spelled the same but pronounced differently depending on the context.


Add in peculiar idioms like “cold turkey” or “raining cats and dogs,” and it’s no wonder English can confound even its native speakers, let alone learners

The Role of the Apostrophe

Quick grammar refresher: Apostrophes serve two main purposes.

They indicate possession, as in “children’s toys” or “the director’s film,” and they replace omitted letters in contractions like “don’t” (do not) or “there’s” (there is).

The apostrophe in o’clock serves the latter purpose, signaling that part of the original phrase has been dropped—though many people have forgotten what that was.

What Does “O’Clock” Mean?

The “O” in o’clock stands for “of the,” according to the Britannica Dictionary. So when someone says “it’s six o’clock,” they’re actually saying “it’s six of the clock.” While this phrasing might sound unusual to modern ears, it was once a common way of saying “according to the clock.”

The Origin of “Of the Clock”

This phrase emerged when mechanical clocks became widespread in Europe during the late 1300s.

Before then, people relied on sundials and shadow clocks to track time.

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