within

US /wɪˈðɪn/
UK /wɪˈðɪn/
"within" picture
1.

inside (something)

:
The answer is within these pages.
He remained within the boundaries of the park.
2.

not further off than (a specified distance or limit)

:
Please reply within seven days.
The delivery will be made within 24 hours.
1.

inside; internally

:
The noise came from within.
He felt a strange sensation within.