WordReference Random House Learner's Dictionary of American English © 2017
de•crease /v. dɪˈkris; n. ˈdikris, dɪˈkris/USA pronunciation   v.,  -creased, -creas•ing, n. 
  1. to lessen, esp. by degrees;
    (cause to) diminish: [no obj ]:Water consumption had to decrease to avoid a drought.[ + obj ]:They told us to decrease spending.

n. [countable]
  1. the act or process of decreasing.
  2. the amount by which a thing is lessened:a decrease of only 15%.
de•creas•ing, adj.  [before a noun]:decreasing interest rates.
de•creas•ing•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2017
de•crease  (v. di krēs;n. dēkrēs, di krēs),USA pronunciation v.,  -creased, -creas•ing, n. 
  1. to diminish or lessen in extent, quantity, strength, power, etc.:During the ten-day march across the desert their supply of water decreased rapidly.

  1. to make less;
    cause to diminish:to decrease one's work load.

  1. the act or process of decreasing;
    condition of being decreased;
    gradual reduction:a decrease in sales; a decrease in intensity.
  2. the amount by which a thing is lessened:The decrease in sales was almost 20 percent.
  • Latin dēcrēscere (dē- de- + crēscere to grow); see crescent
  • Old French decreiss-, long stem of decreistre
  • Middle English decres (noun, nominal), decresen (verb, verbal) 1350–1400
    • 1.See corresponding entry in Unabridged wane, lessen, fall off, decline, contract, abate.
      Decrease, diminish, dwindle, shrink imply becoming smaller or less in amount.
      Decrease commonly implies a sustained reduction in stages, esp. of bulk, size, volume, or quantity, often from some imperceptible cause or inherent process:The swelling decreased daily.Diminish usually implies the action of some external cause that keeps taking away:Disease caused the number of troops to diminish steadily.Dwindle implies an undesirable reduction by degrees, resulting in attenuation:His followers dwindled to a mere handful.Shrink esp. implies contraction through an inherent property under specific conditions:Many fabrics shrink in hot water.
    • 3.See corresponding entry in Unabridged abatement, decline, subsidence, shrinking, dwindling, ebbing.
    • 1.See corresponding entry in Unabridged increase, expand.

Collins Concise English Dictionary © HarperCollins Publishers::

decrease vb /dɪˈkriːs/
  1. to diminish or cause to diminish in size, number, strength, etc
n /ˈdiːkriːs; dɪˈkriːs/
  1. the act or process of diminishing; reduction
  2. the amount by which something has been diminished
Etymology: 14th Century: from Old French descreistre, from Latin dēcrescere to grow less, from de- + crescere to grow

deˈcreasing adj deˈcreasingly adv

'decreased' also found in these entries:

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