a definite length of time marked off by two instants
a set containing all points (or all real numbers) between two given endpoints
a period of time considered as a resource under your control and sufficient to accomplish something
an indefinite period (usually marked by specific attributes or activities)
the continuum of experience in which events pass from the future through the present to the past
a person's experience on a particular occasion
a reading of a point in time as given by a clock
