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Decay vs Decline - What's the difference?

decay | decline |

In intransitive terms the difference between decay and decline

is that decay is to deteriorate, to get worse, to lose strength or health, to decline in quality while decline is to become weaker or worse.

In transitive terms the difference between decay and decline

is that decay is to cause to rot or deteriorate while decline is to refuse, forbear.

decay

English

(wikipedia decay)

Noun

  • The process or result of being gradually decomposed.
  • * 1895 , H. G. Wells, The Time Machine Chapter X
  • I fancied at first the stuff was paraffin wax, and smashed the jar accordingly. But the odor of camphor was unmistakable. It struck me as singularly odd, that among the universal decay , this volatile substance had chanced to survive, perhaps through many thousand years.
  • A deterioration of condition.
  • Derived terms

    * bacterial decay * decayability * decayable * decayer * orbital decay * particle decay * radioactive decay

    Verb

    (en verb)
  • To deteriorate, to get worse, to lose strength or health, to decline in quality.
  • The pair loved to take pictures in the decaying hospital on forty-third street.
  • # (intransitive, electronics, of storage media or the data on them) To undergo , that is, gradual degradation.
  • # (intransitive, computing, of software) To undergo , that is, to fail to be updated in a changing environment,so as to eventually become legacy or obsolete.
  • # (intransitive, physics, of a satellite's orbit) To undergo prolonged reduction in altitude (above the orbited body).
  • 2009 , Francis Lyall, Paul B. Larsen, Space Law: A Treatise , page 120:
  • Damaged on lift-off, Skylab was left in orbit until its orbit decayed .
  • (of organic material) To rot, to go bad.
  • The cat's body decayed rapidly.
  • (intransitive, transitive, physics, chemistry, of an unstable atom) To change by undergoing fission, by emitting radiation, or by capturing or losing one or more electrons.
  • * 2005 , Encyclopedia of Earth Science (edited by Timothy M. Kusky; ISBN 0-8160-4973-4), page 349:
  • Uranium decays to radium through a long series of steps with a cumulative half-life of 4.4 billion years.
  • (intransitive, transitive, physics, of a quantum system) To undergo , that is, to relax to a less excited state, usually by emitting a photon or phonon.
  • (aviation)
  • To cause to rot or deteriorate.
  • The extreme humidity decayed the wooden sculptures in the museum's collection in a matter of years.
  • * Shakespeare
  • Infirmity, that decays the wise.

    decline

    English

    Noun

    (en noun)
  • Downward movement, fall.(rfex)
  • A sloping downward, e.g. of a hill or road.(rfex)
  • (senseid)A weakening.(rfex)
  • * {{quote-magazine, date=2012-01
  • , author=Philip E. Mirowski , title=Harms to Health from the Pursuit of Profits , volume=100, issue=1, page=87 , magazine= citation , passage=In an era when political leaders promise deliverance from decline through America’s purported preeminence in scientific research, the news that science is in deep trouble in the United States has been as unwelcome as a diagnosis of leukemia following the loss of health insurance.}}
  • A reduction or diminution of activity.
  • *
  • It is also pertinent to note that the current obvious decline in work on holarctic hepatics most surely reflects a current obsession with cataloging and with nomenclature of the organisms—as divorced from their study as living entities.

    Antonyms

    * incline

    Verb

    (declin)
  • To move downwards, to fall, to drop.
  • To become weaker or worse.
  • To bend downward; to bring down; to depress; to cause to bend, or fall.
  • * Thomson
  • in melancholy deep, with head declined
  • * Spenser
  • And now fair Phoebus gan decline in haste / His weary wagon to the western vale.
  • To cause to decrease or diminish.
  • * Beaumont and Fletcher
  • You have declined his means.
  • * Burton
  • He knoweth his error, but will not seek to decline it.
  • To turn or bend aside; to deviate; to stray; to withdraw.
  • a line that declines from straightness
    conduct that declines from sound morals
  • * Bible, Psalms cxix. 157
  • Yet do I not decline from thy testimonies.
  • To refuse, forbear.
  • * Massinger
  • Could I decline this dreadful hour?
  • * , chapter=7
  • , title= The Mirror and the Lamp , passage=“[…] This is Mr. Churchill, who, as you are aware, is good enough to come to us for his diaconate, and, as we hope, for much longer; and being a gentleman of independent means, he declines to take any payment.” Saying this Walden rubbed his hands together and smiled contentedly.}}
  • To inflect for case, number and sometimes gender.
  • * Ascham
  • after the first declining of a noun and a verb
  • (by extension) To run through from first to last; to repeat like a schoolboy declining a noun.
  • (Shakespeare)
  • (American football) To reject a penalty against the opposing team, usually because the result of accepting it would benefit the non-penalized team less than the preceding play.
  • The team chose to decline the fifteen-yard penalty because their receiver had caught the ball for a thirty-yard gain.

    Derived terms

    * declension * declination