a. A nonspatial continuum in which events occur in apparently irreversible succession from the past through the present to the future.
b. An interval separating two points on this continuum; a duration: a long time since the last war; passed the time reading.
c. A number, as of years, days, or minutes, representing such an interval: ran the course in a time just under four minutes.
d. A similar number representing a specific point on this continuum, reckoned in hours and minutes: checked her watch and recorded the time, 6:17 a.m.
e. A system by which such intervals are measured or such numbers are reckoned: solar time.