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1. Unvarying in nature
   "maintained a constant temperature"
   - changeless, invariant, unvarying
    
2. Steadfast in purpose or devotion or affection
   "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star"
    
3. Uninterrupted in time and indefinitely long continuing
   "in constant pain"
   - ceaseless, incessant, never-ending, perpetual, unceasing, unremitting

1. A quantity that does not vary
   - constant quantity, invariable
    
2. A number representing a quantity assumed to have a fixed value in a specified mathematical context
   "the velocity of light is a constant"

Derived forms: constants

See also: constancy, constantly, continuous, faithful, invariable, stable, staunch, steadfast, unchangeable, unfailing, unflagging, uninterrupted, unswerving

Type of: number, quantity

Antonym: inconstant

Encyclopedia: Constant