Definition of outside

• n. - The external part of a thing; the part, end, or side which forms the surface; that which appears, or is manifest; that which is superficial; the exterior.
• n. - The part or space which lies without an inclosure; the outer side, as of a door, walk, or boundary.
• n. - The furthest limit, as to number, quantity, extent, etc.; the utmost; as, it may last a week at the outside.
• n. - One who, or that which, is without; hence, an outside passenger, as distinguished from one who is inside. See Inside, n. 3.
• a. - Of or pertaining to the outside; external; exterior; superficial.
• a. - Reaching the extreme or farthest limit, as to extent, quantity, etc.; as, an outside estimate.
• adv. - or prep. On or to the outside (of); without; on the exterior; as, to ride outside the coach; he stayed outside.