constant
adjective
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steadfast in purpose or devotion or affection“We are constant in adherence to our ideals.”
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uninterrupted in time and indefinitely long continuingceaseless
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unvarying in nature“maintained a constant temperature”changeless
noun
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a quantity that does not varyinvariableconstant quantity
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a number representing a quantity assumed to have a fixed value in a specified mathematical context“the velocity of light is a constant”