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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:

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

fixed, permanent, abiding, unchangeable, lasting, everlasting, enduring, persistent, immutable, perpetual

immortal, eternal, uninterrupted, infinite

invariable, coherent, nonstop, featureless, flat, undying, un-intermittent, seamless, unending, ceaseless, unvarying, consecutive, even, undeviating, continuing, uniform, continuous, perennial, unceasing, connected, repeated, consistent, straight, gapless, unremitting, interminable, level, homogeneous, unchanging, incessant, sequential, endless, repetitive, unbroken, robot-like, monolithic

familiar, mundane, metronomic, periodic, epochal, commonplace, ordinary, conventional, continual, standard, frequent, everyday, chronic, predominating, steady, stock, general, orthodox, accustomed, habitual, average, recurrent, prevailing, regular, rhythmic, monotonous, routine, customary, universal, traditional, common, cyclical, normal, usual, canonical

durable, solid, stable, immovable, changeless

implacable, indomitable, loyal, committed, resolute, devoted, fearless, unbending, persevering, ruthless, bold, tenacious, valiant, tireless, willing, unyielding, deliberate, uncompromising, dauntless, determined, decisive, true, dedicated, tough, indefatigable, hearty, diligent, reliable, iron-willed, strong-minded, unshakeable, relentless, dogged, staunch, stern, strong-willed, bullheaded, faithful, stubborn, thorough, steely, courageous, insistent, plucky, headstrong, zealous, steadfast, serious, unwavering, unflinching, firm, earnest, resolved, intent, set, decided, inexorable, spunky

Usage examples:

• " Dear Mary," he said, " if you could only know how constant my thoughts are to you." - "An Old Man's Love", Anthony Trollope.
• You led us to believe, this evening, that, although all letters had been destroyed, you were in constant communication with Freistner. - "The Devil's Paw", E. Phillips Oppenheim.
• Goods in general, other than money, may rise in value, while money remains constant in value. - "The Value of Money", Benjamin M. Anderson, Jr..