n (heading) Of time.
n (now rare, archaic) Free time; leisure, opportunity.
n A specific (specified) period of time.
n An undefined period of time (without qualifier, especially a short period); a while.
n (heading) Unlimited or generalized extent, physical or otherwise.
n Distance between things.
n Physical extent across two or three dimensions (sometimes for or to do something).
n 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.
n The near-vacuum in which planets, stars and other celestial objects are situated; the universe beyond the earth's atmosphere.
n The physical and psychological area one needs within which to live or operate; personal freedom.
n (heading) A bounded or specific extent, physical or otherwise.
n A (chiefly empty) area or volume with set limits or boundaries.
n (music) A position on the staff or stave bounded by lines.
n A gap in text between words, lines etc., or a digital character used to create such a gap.
n (letterpress typography) 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).
n A gap; an empty place.
n (geometry) A set of points, each of which is uniquely specified by a number (the dimensionality) of coordinates.
n (countable, mathematics) 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).
n (countable, figuratively) A field, area, or sphere of activity or endeavour.
n Anything analogous to a physical space in which one can interact, such as an online chat room.
v (obsolete, intransitive) To roam, walk, wander.
v (transitive) To set some distance apart.
v To insert or utilise spaces in a written text.
v To space out (become distracted, lose focus).
v (transitive, science fiction) To eject into outer space, usually without a space suit.
v (intransitive, science fiction) To travel into and through outer space.
n A surname.