<p><strong>Adverb</strong></p><ul><li>in or into the interior or inner part; inside.</li><li>in or into a house, building, etc.; indoors: The fire was burning on the hearth within.</li><li>on, or as regards, the inside; internally.</li><li>inside an enclosed place, area, room, etc.: He was startled by a cry from within.</li><li>in the mind, heart, or soul; inwardly.</li></ul><p><strong>Preposition</strong></p><ul><li>in or into the interior of or the parts or space enclosed by: within city walls.</li><li>inside of; in.</li><li>in the compass or limits of; not beyond: within view; to live within one's income.</li><li>at or to some point not beyond, as in length or distance; not farther than: within a radius of a mile.</li><li>at or to some amount or degree not exceeding: within two degrees of freezing.</li><li>in the course or period of, as in time: within one's memory; within three minutes.</li><li>inside of the limits fixed or required by; not transgressing: within the law.</li><li>in the field, sphere, or scope of: within the family; within one's power.</li></ul><p><strong>Noun</strong></p><ul><li>the inside of a place, space, or building.</li></ul>