S: (n) constant (a number representing a quantity assumed to have a fixed value in a specified mathematical context) "the velocity of light is a constant"
S: (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"
S: (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"