The Collaborative International Dictionary of English v.0.48:

Within \With*in"\, prep. [OE. withinne, withinnen, AS.
   wi[eth]innan; wi[eth] with, against, toward + innan in,
   inwardly, within, from in in. See With, prep., In, prep.]
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   1. In the inner or interior part of; inside of; not without;
      as, within doors.
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            O, unhappy youth!
            Come not within these doors; within this roof
            The enemy of all your graces lives.   --Shak.
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            Till this be cured by religion, it is as impossible
            for a man to be happy -- that is, pleased and
            contented within himself -- as it is for a sick man
            to be at ease.                        --Tillotson.
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   2. In the limits or compass of; not further in length than;
      as, within five miles; not longer in time than; as, within
      an hour; not exceeding in quantity; as, expenses kept
      within one's income. "That he repair should again within a
      little while." --Chaucer.
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            Within these five hours lived Lord Hastings,
            Untainted, unexamined, free, at liberty. --Shak.
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   3. Hence, inside the limits, reach, or influence of; not
      going outside of; not beyond, overstepping, exceeding, or
      the like.
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            Both he and she are still within my power. --Dryden.
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            Within himself
            The danger lies, yet lies within his power.
                                                  --Milton.
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            Were every action concluded within itself, and drew
            no consequence after it, we should, undoubtedly,
            never err in our choice of good.      --Locke.
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The Collaborative International Dictionary of English v.0.48:

Within \With*in"\, adv.
   1. In the inner part; inwardly; internally. "The wound
      festers within." --Carew.
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            Ills from within thy reason must prevent. --Dryden.
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   2. In the house; in doors; as, the master is within.
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WordNet (r) 3.0 (2006):

within
    adv 1: on the inside; "inside, the car is a mess" [syn:
           inside, within] [ant: outside]