constant
noun
a quantity that does not vary
a number representing a quantity assumed to have a fixed value in a specified mathematical context
“the velocity of light is a constant”
adjective
unvarying in nature
“maintained a constant temperature”
“principles of unvarying validity”
steadfast in purpose or devotion or affection
“a man constant in adherence to his ideals”
“a constant lover”
Oppositesinconstantuninterrupted in time and indefinitely long continuing
“the ceaseless thunder of surf”
“in constant pain”
Source: WordNet 3.1, Princeton University
