in or into a house, building, etc.; indoors:The fire was burning on the hearth within.
on, or as regards, the inside; internally.
inside an enclosed place, area, room, etc.:He was startled by a cry from within.
in the mind, heart, or soul; inwardly.
prep.
in or into the interior of or the parts or space enclosed by:within city walls.
inside of; in.
in the compass or limits of; not beyond:within view; to live within one's income.
at or to some point not beyond, as in length or distance; not farther than:within a radius of a mile.
at or to some amount or degree not exceeding:within two degrees of freezing.
in the course or period of, as in time:within one's memory; within three minutes.
inside of the limits fixed or required by; not transgressing:within the law.
in the field, sphere, or scope of:within the family; within one's power.
n.
the inside of a place, space, or building.
Middle English withinne (preposition and adverb, adverbial), Old English withinnan (adverb, adverbial), equivalent. to withwith- + innan from within, equivalent. to inin + -an suffix of motion from bef. 1000