outer The outer parts of something are the parts which contain or enclose the other parts, and which are furthest from the centre. adj ADJ n (Antonym: inner)
He heard a voice in the outer room., ...the outer suburbs of the city.
outer space
Outer space is the area outside the earth's atmosphere where the other planets and stars are situated. n-uncount
In 1957, the Soviets launched Sputnik 1 into outer space.