within
adv. placeadv. inside a building, a container, or a person's mind. You use it to describe something that is not on the outside.
adv. inside a particular space, structure, or organization; internally. Often used to describe feelings or thoughts that are not expressed openly.
The house looks old, but it is beautiful within.
The organization faced many challenges from within as staff members disagreed on the new policy.
While the exterior of the cathedral was heavily damaged during the war, the intricate mosaics preserved within remained remarkably intact for future generations to study.
From Middle English withinne, withinnen, from Old English wiþinnan; equivalent to with + in.
As an adverb, it typically follows the verb or the noun it modifies; it is more formal than 'inside'.