Within Definition

wĭth-ĭn, wĭth-

adverb

In or into the interior; on the inside; internally.

Webster's New World

Indoors.

Webster's New World

Inside the body, mind, heart, etc.; inwardly.

Webster's New World

Synonyms:

Antonyms:

preposition

In the inner part of; inside.

Webster's New World

Not beyond in distance, time, degree, range, scope, etc.

Within a mile, within one's experience.

Webster's New World

Inside the limits of.

Within the law.

Webster's New World

In the scope or sphere of.

Acted within the law; within the medical profession.

American Heritage

Used to indicate a range to be covered or an amount necessary before something can happen.

The team has pulled to within three points and can tie the game with a field goal.

American Heritage

noun

An inner position, place, or area.

Treachery from within.

American Heritage

The inside or the interior.

Webster's New World

Origin of Within

Middle English withinne from Old English withinnan with with with innan from within (from in in in¹)

From American Heritage Dictionary of the English Language, 5th Edition
Old English wiþinnan. More at with- +"Ž in.

From Wiktionary