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n.
something that resembles a flowing stream in moving continuously; "a stream of people emptied from the terminal"; "the museum had planned carefully for the flow of visitors"
n.
a steady flow of a fluid (usually from natural causes); "the raft floated downstream on the current"; "he felt a stream of air"; "the hose ejected a stream of water"
n.
dominant course (suggestive of running water) of successive events or ideas; "two streams of development run through American history"; "stream of consciousness"; "the flow of thought"; "the current of history"
n.
(chemistry) the ratio of the total mass of an element in the earth's crust to the total mass of the earth's crust; expressed as a percentage or in parts per million