(noun, adjective)


1. unvarying in nature

- maintained a constant temperature

Similar word(s): invariable, 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

Similar word(s): unchangeable, immutable, staunch, steadfast, unswerving, unfailing, unflagging, faithful, stable, invariable

3. uninterrupted in time and indefinitely long continuing

- in constant pain

Similar word(s): continuous, uninterrupted, ceaseless, incessant, perpetual, unceasing, unremitting


1. a quantity that does not vary

Similar word(s): invariable

Definition categories: thought, quantity

2. a number representing a quantity assumed to have a fixed value in a specified mathematical context

- the velocity of light is a constant

Definition categories: quantity, number