(billiards) In the balk-line game, any of eight spaces, 7 × 3½ inches, lying along a cushion and bisected transversely by a balk line. Object balls in an anchor space are treated as in balk.

(physics, dated) The dark space within the negative-pole glow at the cathode of a vacuum tube, observed only when the pressure is low enough to give a striated discharge.

A dyeing technique that uses a mordant to produce multicolored yarn.

To stare in an absent-minded or unfocused way.

plural of space agency

A government agency engaged in activities related to outer space and space exploration.

(typography) A space which has a nominal width of 1 em.

(topology) A topological space in which for any two distinct points x and y, there is a pair of disjoint open sets U and V such that x∈U and y∈V.

(letterpress typography) A metal block used to separate words, one third of an em in width. / (typography) In digital text, a character representing a thick space.

(typography) A space which has a nominal width of 1 en