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Constant vs Instant - What's the difference?

constant | instant |

As adjectives the difference between constant and instant

is that constant is unchanged through time or space; permanent while instant is impending; imminent.

As nouns the difference between constant and instant

is that constant is that which is permanent or invariable while instant is a very short period of time; a moment.

As an adverb instant is

at once; immediately.

constant

English

Adjective

(en adjective)
  • Unchanged through time or space; permanent.
  • Consistently recurring over time; persistent.
  • * {{quote-magazine, date=2013-11-16, volume=409, issue=8862, magazine=(The Economist), author=Schumpeter
  • , title= The mindfulness business , passage=The constant pinging of electronic devices is driving many people to the end of their tether. Electronic devices not only overload the senses and invade leisure time. They feed on themselves: the more people tweet the more they are rewarded with followers and retweets.}}
  • Steady in purpose, action, feeling, etc.
  • * Sir (Philip Sidney) (1554-1586)
  • Both loving one fair maid, they yet remained constant friends.
  • * (William Shakespeare) (1564-1616)
  • I am constant to my purposes.
  • * (John Dryden) (1631-1700)
  • His gifts, his constant courtship, nothing gained.
  • Firm; solid; not fluid.
  • * (Robert Boyle) (1627-1691)
  • Ifyou mix them, you may turn these two fluid liquors into a constant body.
  • (obsolete) Consistent; logical.
  • * Shakespeare, Twelfth Night IV.ii
  • I am no more mad than you are: make the trial of it with any constant question.

    Noun

    (en noun)
  • That which is permanent or invariable.
  • (algebra) A quantity that remains at a fixed value throughout a given discussion.
  • (science) Any property of an experiment, determined numerically, that does not change under given circumstances.
  • (computing) An identifier that is bound to an invariant value; a fixed value given a name to aid in readability of source code.
  • See also

    * (computing) literal ----

    instant

    English

    Alternative forms

    * instaunt (obsolete)

    Etymology 1

    From (etyl) . More at (l), (l).

    Noun

    (en noun)
  • A very short period of time; a moment.
  • * She paused for only an instant , which was just enough time for John to change the subject.
  • A single, usually precise, point in time.
  • * The instant the alarm went off, he fled the building.
  • An instant beverage or food, especially instant coffee.
  • A day of the current month (abbreviated as : )
  • * In response to your letter of the twenty-first instant...
  • Etymology 2

    From (etyl) and (etyl) instant, from (etyl) ; see state.

    Adjective

    (-)
  • (dated) Impending; imminent.
  • * Prior
  • Impending death is thine, and instant doom.
  • (dated) Urgent; pressing; acute.
  • * Bible, Rom. xii. 12
  • Rejoicing in hope; patient in tribulation; continuing instant in prayer.
  • * Carlyle
  • I am beginning to be very instant for some sort of occupation.
  • Occurring immediately; immediate; present.
  • * Fuller
  • The instant time is always the fittest time.
  • * {{quote-book, year=1905, author=
  • , title= , chapter=2 citation , passage=No one, however, would have anything to do with him, as Mr. Keeson's orders in those respects were very strict ; he had often threatened any one of his employés with instant dismissal if he found him in company with one of these touts.}}
  • Lasting for a short moment; momentary; short-lived.
  • Very quickly and easily prepared.
  • instant coffee
  • Of the current month (abbreviation inst.).
  • * “I refer to your letter of the 16th inst. in regard to traffic disruption”
  • Derived terms
    * instantize, instantise * instantly * instant replay

    Adverb

    (-)
  • (poetic) At once; immediately.
  • * 1819 , Lord Byron, Don Juan , I.182:
  • He left the room for his relinquished sword, / And Julia instant to the closet flew.

    Statistics

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