A quad which has a fixed width of 1 em.
A piece of metal type used to separate words, cast lower than other type so as not to take ink, especially one that is narrower than one en (compare quad).
A (chiefly empty) area or volume with set limits or boundaries.
Physical extent across two or three dimensions (sometimes for or to do something).
A set of points, each of which is uniquely specified by a number (the dimensionality) of coordinates.
A field, area, or sphere of activity or endeavour.
A gap; an empty place.
An undefined period of time (without qualifier, especially a short period); a while.
The physical and psychological area one needs within which to live or operate; personal freedom.
Distance between things.
A generalized construct or set whose members have some property in common; typically there will be a geometric metaphor allowing these members to be viewed as "points". Often used with a restricting modifier describing the members (e.g. vector space), or indicating the inventor of the construct (e.g. Hilbert space).
The near-vacuum in which planets, stars and other celestial objects are situated; the universe beyond the earth's atmosphere.
A specific (specified) period of time.
A position on the staff or stave bounded by lines.
Physical extent in all directions, seen as an attribute of the universe (now usually considered as a part of space-time), or a mathematical model of this.
A gap in text between words, lines etc., or a digital character used to create such a gap.
Anything analogous to a physical space in which one can interact, such as an online chat room.
To insert or utilise spaces in a written text.
To set some distance apart.
To eject into outer space, usually without a space suit.
To travel into and through outer space.