- not changing or varying; uniform; regular; invariable: All conditions during the three experiments were constant.
- continuing without pause or letup; unceasing: constant noise.
- regularly recurrent; continual; persistent: He found it impossible to work with constant interruption.
- faithful; unswerving in love, devotion, etc.: a constant lover.
- steadfast; firm in mind or purpose; resolute.
- Obsolete. certain; confident.
- something that does not or cannot change or vary.
- Physics. a number expressing a property, quantity, or relation that remains unchanged under specified conditions.
- Mathematics. a quantity assumed to be unchanged throughout a given discussion.
Origin of constant
SynonymsSee more synonyms for constant on Thesaurus.com
- fixed and invariable; unchanging
- continual or continuous; incessantconstant interruptions
- resolute in mind, purpose, or affection; loyal
- something that is permanent or unchanging
- a specific quantity that is always invariablethe velocity of light is a constant
- mathsa symbol representing an unspecified number that remains invariable throughout a particular series of operations
- physicsa theoretical or experimental quantity or property that is considered invariable throughout a particular series of calculations or experiments
- See logical constant
- Benjamin (bɛ̃ʒamɛ̃). real name Henri Benjamin Constant de Rebecque. 1767–1830, French writer and politician: author of the psychological novel Adolphe (1816)
Word Origin and History for quasi-constant
late 14c., "steadfast, resolute," from Old French constant (14c.) or directly from Latin constantem (nominative constans) "standing firm, stable, steadfast, faithful," present participle of constare, from com- "together" (see com-) + stare "to stand," from PIE root *sta- "to stand" (see stet). Of actions and conditions from 1650s. Related: Constantly.
1832 in mathematics and physics, from constant (adj.).
- Continually occurring; persistent.
- Unchanging in nature, value, or extent; invariable.
- A quantity assumed to have a fixed value in a specified mathematical context.
- An experimental or theoretical condition, factor, or quantity that does not vary or that is regarded as invariant in specified circumstances.
- A quantity that is unknown but assumed to have a fixed value in a specified mathematical context.
- A theoretical or experimental quantity, condition, or factor that does not vary in specified circumstances. Avogadro's number and Planck's constant are examples of constants.