What does "within" mean?

Within: 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. Within these five hours lived Lord Hastings, Untainted, unexamined, free, at liberty. Shak.

Additional senses

  1. 2.Hence, inside the limits, reach, or influence of; not going outside of; not beyond, overstepping, exceeding, or the like. Both he and she are still within my power. Dryden. Within himself The danger lies, yet lies within his power. Milton. Were every action concluded within itself, and drew no consequence after it, we should, undoubtedly, never err in our choice of good. Locke.
  2. 3.In the inner part; inwardly; internally. "The wound festers within." Carew. Ills from within thy reason must prevent. Dryden.
  3. 4.In the house; in doors; as, the master is within.

Sources