used to indicate enclosure or containment, esp in something large; inside (something)
within the castle walls
to the inside of (something)
in or into the range of (something)
not beyond the quantity or limitations of (something)
not further than a specified distance
within a mile
in or into the scope of (something)
within one's rights
during the course of (a period of time)
will be gone within a week
[Old English withinnan, from with + innan inwardly, within]