the outer side, surface, or part; exterior

The outside of the house needs painting.

the external aspect or appearance.

the space without or beyond an enclosure, institution, boundary, etc.

a prisoner about to resume life on the outside.

a position away or farther away from the inside or center

The horse on the outside finished second.

an outside passenger or place on a coach or other vehicle.

Northern Canada and Alaska . ( sometimes initial capital letter ) the settled or more populous part of Canada or the U.S.

being, acting, done, or originating beyond an enclosure, boundary, etc.

outside noises; news from the outside world.

situated on or pertaining to the outside; exterior; external

an outside television antenna.

situated away from the inside or center; farther or farthest away from the inside or center

the outside lane.

not belonging to or connected with a specified institution, society, etc.

outside influences; outside help.

extremely unlikely or remote

an outside chance for recovery.

extreme or maximum

an outside estimate.

being in addition to one's regular work or duties

an outside job.

working on or assigned to the outside, as of a place or organization

an outside man to care for the grounds.

Baseball . (of a pitched ball) passing, but not going over, home plate on the side opposite the batter

The fastball was high and outside.

on or to the outside, exterior, or space without

Take the dog outside.

in or to an area that is removed from or beyond a given place or region

The country's inhabitants seldom travel outside.

on or toward the outside of

There was a noise outside the door.

beyond the confines or borders of

visitors from outside the country.

with the exception of; aside from

She has no interests outside her work.

at the outside

at the utmost limit; at the maximum

There weren't more than ten at the outside.

outside of

other than; exclusive of; excepting

Outside of us, no one else came to the party.

adjective

central , inside , internal , middle , certain , definite , good , likely , sure

noun

center , indoors , inside , interior , middle

adjective

alfresco , alien , apart from , away from , exterior , extramural , extraneous , extreme , farther , farthest , foreign , furthest , open-air , out , outdoor , outer , outermost , outward , over , surface , distant , faint , far , marginal , negligible , off , remote , slender , small , unlikely , slight , slim , adventitious , exogenous , external , extracurricular , extrinsic , supererogatory , transcendent

noun

appearance , covering , facade , face , front , integument , open , open air , outdoors , seeming , sheath , skin , surface , topside , without , top , ultimate , utmost , uttermost , alfresco , distant , exterior , external , faint , farthest , remove , slender , slight , slim , small , unlikely