1. (noun) constant, constant quantity, invariable
a quantity that does not vary
2. (adj) constant
a number representing a quantity assumed to have a fixed value in a specified mathematical context
"the velocity of light is a constant"
3. (adj) changeless, constant, invariant, unvarying
unvarying in nature
"maintained a constant temperature"; "principles of unvarying validity"
4. (adj) constant
steadfast in purpose or devotion or affection
"a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star"
5. (adj) ceaseless, constant, incessant, never-ending, perpetual, unceasing, unremitting
uninterrupted in time and indefinitely long continuing
"the ceaseless thunder of surf"; "in constant pain"; "night and day we live with the incessant noise of the city"; "the never-ending search for happiness"; "the perpetual struggle to maintain standards in a democracy"; "man's unceasing warfare with drought and isolation"; "unremitting demands of hunger"
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Definition of 'constant' 
