1. A linear projection of when events occur from the past, the present, or are projected into the future: Government officials have hopes that in time the political resolution of problems among nations will occur instead of resorting to military solutions.
2. A lapse between the occurrences of events: Norbert passed the time waiting for the bus to arrive by reading and chatting with others who were waiting with him.
3. A manner, typically involving numbers that indicate when an event, etc. took place or may have taken place: Jane asked, "Jim, how much time has passed since we last got together?"
4. The indication of a period or interval of surrounding events: The past five years have been hard times for the factory.
5. An indication of when prevailing events or trends occur: By hiring a woman CEO, the organization was certainly in tune with the times.
6. Specific seasons or opportunities for events that take place: The village was celebrating harvest time by having a fair.
7. The occasion or opportunity in which to complete an activity: Mother said, "Mildred, there will be plenty of time to finish your homework."
8. An instance or specific occasion in which something happens: The time of little Glenda's birth was midnight on New Year’s Eve.

1. To choose an hour, a day, a month, a year, etc. when something is to happen at an indicated schedule: Matthew timed his trip to coincide with the summer vacation at his university.
2.To make something happen at a certain minute: The senator timed his speech to take place just before the congressional recess was to take place for the summer.

Time determined by the actual position of the sun in the sky which corresponds to time on most sundials.

Time as given by atomic clocks, which are regulated by natural resonance frequencies of particular atoms, and display a continuous count of seconds.

The official system of mean solar time, used to calculate data for tables of changing astronomical phenomena (ephemerides).

Horology by Donald De Carle; Dover Publications, Inc.; New York; 1965.

The average length of time an entity remains in a particular part of its cycle; for example, the residence time of water in the deep ocean is the average time a water parcel remains in the deep sea.

The term is often used in environmental chemistry to denote the length of time an ion or compound remains in the atmosphere or surface waters.

1. Time that is measured by the stars rather than by the sun.
2. A unit of time used in astronomy, equal to the period of time in which the earth makes one rotation relative to the stars.
3. The time taken between successive meridian passages of the same star (23 hours, 56 minutes, 4.091 seconds).

The sidereal day is about four minutes shorter than the twenty-four hours of the solar day.