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constant (adj.)

late 14c., "steadfast, resolute; patient, unshakable; fixed or firm in mind," from Old French constant (14c.) or directly from Latin constantem (nominative constans) "standing firm, stable, steadfast, faithful," present participle of constare"to stand together," from assimilated form of com "with, together" (see con-) + stare "to stand," from PIE root *sta- "to stand, make or be firm."

Meaning "steadfast in attachment to a person or cause" is from early 15c. Of actions and conditions, "fixed, not varying" (1540s); "continual, enduring" (1650s). Meaning "regularly recurring" is from 1817. Related: Constantly.

Origin and meaning of constant

constant (n.)

1832 in mathematics and physics, "a quantity which is assumed to be invariable throughout," from constant (adj.), which is attested from 1753 in mathematics. The general sense "that which is not subject to change" (1856) is a figurative extension from this.

Origin and meaning of constant

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Definitions of constant from WordNet
1
constant (adj.)
unvarying in nature;
maintained a constant temperature
constant (adj.)
steadfast in purpose or devotion or affection;
a constant lover
a man constant in adherence to his ideals
constant as the northern star
constant (adj.)
uninterrupted in time and indefinitely long continuing;
in constant pain
2
constant (n.)
a quantity that does not vary;
Synonyms: constant quantity / invariable
constant (n.)
a number representing a quantity assumed to have a fixed value in a specified mathematical context;
the velocity of light is a constant
From wordnet.princeton.edu