(in dated typography) A space of non-variable width: ⊣ ⊢ equal to the width of a period (full stop) or comma, inserted after ⟨“⟩ or ⟨‘⟩ and before ⟨”⟩ or ⟨’⟩ (and sometimes ⟨?⟩ or ⟨!⟩), unless a punctuation mark occurs there. It is Unicode character U+2008. When using X11 input method, the conventional key combination is Compose+Space+Period.

(typography, in fonts whose ideographs are of uniform width) A space of non-variable width: ⊣　⊢ equal to the width of an ideograph, used in Chinese, Japanese, Korean, and other languages that use Siniform ideographs.

plural of space opera

(art) The space around and between the subjects of an image.

The informal competition between the United States and the Soviet Union to launch unmanned satellites, send people into space and land them on the Moon.

vector space

Alternative spelling of spacefaring

A natural phenomenon picked up as a radio signal from outer space, and sounding like a loud hiss.

(topology) A space for which properties like uniform continuity and uniform convergence can be formulated.

(topology) A space for which notions of a Cauchy sequence and completeness exist.