with·in 
(wĭth-ĭn, wĭth-)
(wĭth-ĭn, wĭth-)adv.
1. In or into the inner part; inside: "restaurants and wine houses jammed along the earthen streets ... banners flapping to announce the delights within" (Nicole Mones).
2. Inside the mind, heart, or soul; inwardly: the fear that lies within.
prep.
1. In the inner part or parts of; inside: the streets within the city; resentment seething within him.
2.
a. Not exceeding the limits or extent of in distance or time: got within ten miles of home; stayed within earshot; arrived within two days.
b. Not exceeding the fixed limits of; not beyond: lived within her income.
c. In the scope or sphere of: acted within the law; within the medical profession.
d. 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.
n.
An inner position, place, or area: treachery from within.
[Middle English withinne, from Old English withinnan : with, with; see WITH + innan, from within (from in, in; see IN1).]