any distinct time period in a sequence of events
(physical chemistry) a distinct state of matter in a system; matter that is identical in chemical composition and physical state and separated from other material by the phase boundary
the unlimited expanse in which everything is located
an empty area (usually bounded in some way between things)
an area reserved for some particular purpose
any location outside the Earth's atmosphere
a blank character used to separate successive words in writing or printing
a particular point in the time of a cycle; measured from some arbitrary zero and expressed as an angle
