Outside Out"side`, n. 1. 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. There may be great need of an outside where there is little or nothing within. --South. Created beings see nothing but our outside. --Addison. 2. The part or space which lies without an inclosure; the outer side, as of a door, walk, or boundary. I threw open the door of my chamber, and found the family standing on the outside. --Spectator. 3. The furthest limit, as to number, quantity, extent, etc.; the utmost; as, it may last a week at the outside. 4. One who, or that which, is without; hence, an outside passenger, as distinguished from one who is inside. See Inside, n. 3. [Colloq. Eng.], Outside Out"side`, a. 1. Of or pertaining to the outside; external; exterior; superficial. 2. Reaching the extreme or farthest limit, as to extent, quantity, etc.; as, an outside estimate. [Colloq.] Outside finish (Arch.), a term for the minor parts, as corner boards, hanging stiles, etc., required to complete the exterior of a wooden building; -- rare in masonry., Outside Out"side`, adv. or prep. On or to the outside (of); without; on the exterior; as, to ride outside the coach; he stayed outside.