Noun
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continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
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a substance that is fluid at room temperature and pressure
Adjective
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affording change (especially in social status)
"Britain is not a truly fluid society"
"upwardly mobile"
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in cash or easily convertible to cash
"liquid (or fluid) assets"
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smooth and unconstrained in movement
"a long, smooth stride"
"the fluid motion of a cat"
"the liquid grace of a ballerina"
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characteristic of a fluid
capable of flowing and easily changing shape
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subject to change
variable
"a fluid situation fraught with uncertainty"
"everything was unstable following the coup"