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constant
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Adjective
1. Occurring continuously over a period of time.
the constant background noise of the city
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2. Remaining the same over a period of time.
It is important to have a continuous and constant flow rate.
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3. (of a person) unchangingly faithful and dependable.
My constant companions were thoroughly entertained.
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Noun
1. A situation that does not change.
In any business era, the need to collaborate remains a constant.
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2. A quantity or parameter that does not change its value whatever the value of the variables, under a given set of conditions.
Since its differences are the same as the Fibonacci series differences, we can add or subtract a constant to the Fibonacci series.
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3. A number expressing a relation or property which remains the same in all circumstances, or for the same substance under the same conditions.
The diffraction constant for the diffractometer was calculated using a grating with 0.1 turn spacings.
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Origin
1. Late Middle English (in the sense ‘staying resolute or faithful’): from Old French, from Latin constant- ‘standing firm’, from the verb constare, from con- ‘with’ + stare ‘stand’. The noun senses date from the mid 19th century.
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