What is the meaning of Outer?

Outside; external.

Farther from the centre of the inside.

An outer part.

An uncovered section of the seating at a stadium or sportsground.

The fourth circle on a target, outside the inner and magpie.

A shot which strikes the outer of a target.

The smallest single unit sold by wholesalers to retailers, usually one retail display box.

Someone who admits to something publicly.

Someone who outs another.

One who puts out, ousts, or expels.

An ouster; dispossession.

One who supports leaving the European Union.

comparative form of out ((more) open about one's sexuality, etc): more out

Source: wiktionary.org