Endless and Constant

adjective

• Tiresomely long; seemingly without end.
  • usage: "endless debates"; "an endless conversation"; "the wait seemed eternal"; "eternal quarreling"; "an interminable sermon"
  • synonyms: eternal, interminable
• Infinitely great in number.
  • usage: "endless waves"
• Having no known beginning and presumably no end.
  • usage: "the dateless rise and fall of the tides"; "time is endless"; "sempiternal truth"
  • synonyms: dateless, sempiternal
• Having the ends united so as to form a continuous whole.
  • usage: "an endless chain"

• (a.) Infinite; excessive; unlimited.
• (a.) Void of design; objectless; as, an endless pursuit.
• (a.) Without end; having no end or conclusion; perpetual; interminable; -- applied to length, and to duration; as, an endless line; endless time; endless bliss; endless praise; endless clamor.
• (a.) Without profitable end; fruitless; unsatisfying.

noun

• A quantity that does not vary.
  • synonyms: constant quantity, invariable
• A number representing a quantity assumed to have a fixed value in a specified mathematical context.
  • usage: "the velocity of light is a constant"

adjective

• Unvarying in nature.
  • usage: "maintained a constant temperature"; "principles of unvarying validity"
  • synonyms: changeless, invariant, unvarying
• Steadfast in purpose or devotion or affection.
  • usage: "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star"
• Uninterrupted in time and indefinitely long continuing.
  • usage: "the ceaseless thunder of surf"; "in constant pain"; "night and day we live with the incessant noise of the city"; "the never-ending search for happiness"; "the perpetual struggle to maintain standards in a democracy"; "man's unceasing warfare with drought and isolation"; "unremitting demands of hunger"
  • synonyms: ceaseless, incessant, never-ending, perpetual, unceasing, unremitting

• (v.t.) Not liable or given, to change; permanent; regular; continuous; continually recurring; steadfast; faithful; not fickle.
• (n.) A quantity that does not change its value; -- used in countradistinction to variable.
• (v.t.) Consistent; logical.
• (v.t.) Remaining unchanged or invariable, as a quantity, force, law, etc.
• (v.t.) Firm; solid; fixed; immovable; -- opposed to fluid.
• (n.) That which is not subject to change; that which is invariable.
• (n.) 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.
• (n.) 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.

• French, English: From the Late Latin name Constans, which meant "constant, steadfast"
• English: Variant of Constantine: Steady, stable