The noun constant has 2 senses (first 2 from tagged texts)
1. (6) constant, constant quantity, invariable -- (a quantity that does not vary)
2. (5) constant -- (a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant")
Overview of adj constant
The adj constant has 4 senses (first 3 from tagged texts)
1. (39) changeless, constant, invariant, unvarying -- (persistent in occurrence and unvarying in nature; "maintained a constant temperature"; "principles of unvarying validity")
2. (7) constant, continuant -- (continually recurring or continuing without interruption; "constant repetition of the exercise"; "constant chatter of monkeys")
3. (2) constant -- (steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star")
4. 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")