within
//wɪˈðɪn//
Preposition
1
Inside the limits or bounds of a place, area, or object
The keys are within the drawer.
2
Before the end of a period of time; not longer than
Please reply within three days.
3
Inside the range or scope of something
The project must be completed within budget.
Adverb
1
In or into the interior; inside
The box was empty within.