[n] a quantity that does not vary
[n] a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant"
[adj] steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star"
[adj] continually recurring or continuing without interruption; "constant repetition of the exercise"; "constant chatter of monkeys"
[adj] 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"
[adj] persistent in occurrence and unvarying in nature; "maintained a constant temperature"; "a constant beat"; "principles of unvarying validity"; "a steady breeze"
ceaseless, changeless, constant quantity, continual, continuous, incessant, invariant, never-ending, perpetual, staunch, steadfast, steady, unceasing, unfailing, unflagging, uninterrupted, unremitting, unswerving, unvarying