Time is the indefinite continued progress of existence and events that occur in apparently irreversible succession from the past through the present to the future. Time is a component quantity of various measurements used to sequence events, to compare the duration of events or the intervals between them, and to quantify rates of change of quantities in material reality or in the conscious experience. Time is often referred to as a fourth dimension, along with three spatial dimensions.
John F. Kennedy, "Address in New York City to the National Association of Manufacturers (496)," December 5, 1961, Public Papers of the Presidents: John F. Kennedy, 1961.
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