Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adv. In or into the inner part; inside.
  • adv. Inside the mind, heart, or soul; inwardly.
  • prep. In the inner part or parts of; inside: resentment seething within him.
  • prep. Inside the limits or extent of in time or distance: arrived within two days; stayed within earshot; within ten miles of home.
  • prep. Inside the fixed limits of; not beyond: lived within her income.
  • prep. In the scope or sphere of: acted within the law; within the medical profession.
  • prep. Inside a specified amount or degree: The team had pulled to within five points of winning.
  • n. An inner position, place, or area: treachery from within.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • prep. Indicates spatial enclosure or containment.
  • prep. Indicates figurative inclusion within the scope of.
  • prep. Before the specified duration ends.
  • adv. in or into the interior; inside

from the GNU version of the Collaborative International Dictionary of English

  • adv. In the inner part; inwardly; internally.
  • adv. In the house; in doors.
  • prep. In the inner or interior part of; inside of; not without.
  • prep. In the limits or compass of; not further in length than; ; not longer in time than; ; not exceeding in quantity.
  • prep. Hence, inside the limits, reach, or influence of; not going outside of; not beyond, overstepping, exceeding, or the like.

from The Century Dictionary and Cyclopedia

  • In or into the interior; inside; as regards the inside; on the inside; internally.
  • In the mind, heart, or soul; inwardly.
  • In the house or dwelliug; indoors; at home: as, the master is within.
  • In or into the inner or interior part or parts of; inside of; in the space inclosed or bounded by: as, within the city: opposed to without.
  • Included or comprehended in.
  • Among.
  • In the course, range, reach, compass, or limits of; not beyond or more than: of distance, time, length, quantity.
  • Of time: In the limits or course of; before the expiration of; in: as, he will be here within two hours.
  • Not exceeding the space of; during; throughout.
  • So as not to exceed or overpass; under; below: as, to live within one's income.
  • In; in the purview, scope, or sphere of action of.
  • In advance of; before.
  • All but; lacking.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adv. on the inside

Etymologies

Middle English withinne, from Old English withinnan : with, with; see with + innan, from within (from in, in; see in1).
(American Heritage® Dictionary of the English Language, Fourth Edition)
Old English wiþinnan. More at with- +‎ in. (Wiktionary)

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