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Definition of constant:

  1. A number expressing some property or condition of a substance or of an instrument of precision; as, the dielectric constant of quartz; the collimation constant of a transit instrument.
  2. A number whose value, when ascertained ( as by observation) and substituted in a general mathematical formula expressing an astronomical law, completely determines that law and enables predictions to be made of its effect in particular cases.

Synonyms:

uninterrupted, equable, aeonian, changeless, true-blue, ceaseless, brother, constant quantity, pious, done deal, unflagging, base, stationary, steady, eonian, final, good, irreversible, computation, timeless, extended, hell, steadfast, unvarying, prolonged, continual, common factor, change, allegiant, unalterable, give me a break, for heaven's sake/sakes, trust, what's that supposed to mean?, cube root, Arabic numeral, staunch, a done deal, invariant, arithmetic progression, standardized, purpose, cube, liege, continue, unvaried, give me strength, unswerving, down-the-line, coefficient, trustworthy, stalwart, rigid, unceasing, whatever happens, unremitting, for some time, for pity's sake, for good, stiff, ageless, diehard, incessant, darn, fait accompli, on and on, fast, ongoing, long-term, devout, common multiple, for crying out loud, perpetual, same, unfailing, continuous, what's the big idea?, round-the-clock, long, never-ending, around-the-clock, periodical.

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