Until Definition

ŭn-tĭl

preposition

Up to the time of.

We danced until dawn.

American Heritage

Up to the time of; till (a specified time or occurrence)

Until payday.

Webster's New World

Before (a specified time or occurrence): used with a negative.

Not until tomorrow.

Webster's New World

Unto; to.

American Heritage

To or toward.

Webster's New World

Synonyms:

conjuntion

Up to the time when or that.

Until you leave.

Webster's New World

Before.

You cannot leave until your work is finished.

American Heritage

To the point, degree, or place that.

Heat the water until it boils.

Webster's New World

Before.

Not until he tells you.

Webster's New World

Before (a condition becoming true).

Wiktionary

Origin of Until

Middle English un- up to (from Old Norse und ant- in Indo-European roots) til till till²

From American Heritage Dictionary of the English Language, 5th Edition
From Old Norse und (“as far as, up to") and til (“until, up to")

From Wiktionary