WordReference Random House Learner's Dictionary of American English © 2017
in•crease /v. ɪnˈkris; n. ˈɪnkris/USA pronunciation   v.,  -creased, -creas•ing, n. 
  1. to (cause to) become greater: [no object]Her knowledge increased daily.[+ object]went to school to increase his knowledge of business.

  1. growth in size, strength, or quality:[uncountable]The economy is on the increase.
  2. Business an amount by which something is increased:[countable]an increase of 12%.

WordReference Random House Unabridged Dictionary of American English © 2017
in•crease  (v. in krēs;n. inkrēs),USA pronunciation v.,  -creased, -creas•ing, n. 
  1. to make greater, as in number, size, strength, or quality;
    add to:to increase taxes.

  1. to become greater, as in number, size, strength, or quality:Sales of automobiles increased last year.
  2. Developmental Biologyto multiply by propagation.
  3. to wax, as the moon.

  1. growth or augmentation in numbers, size, strength, quality, etc.:the increase of crime.
  2. the act or process of increasing.
  3. Businessthat by which something is increased.
  4. the result of increasing.
  5. produce of the earth.
  6. Businessproduct;
  7. Developmental Biology[Obs.]
    • multiplication by propagation;
      production of offspring.
    • offspring;
in•creasa•ble, adj. 
in•creas•ed•ly  (in krēsid lē),USA pronunciation adv. 
  • Latin incrēscere, equivalent. to in- in-2 + crēscere to grow; see crescent
  • Anglo-French encres-, Middle French encreiss-, stem of encreistre
  • Middle English incresen, encresen 1275–1325
    • 1.See corresponding entry in Unabridged expand, extend, prolong.
      Increase, augment, enlarge may all mean to make larger.
      To increase means to make greater, as in quantity, extent, degree:to increase someone's salary;
      to increase the velocity;
      to increase the
      (degree of ) concentration. Enlarge means to make greater in size, extent, or range:to enlarge a building, a business, one's conceptions.Augment, a more formal word, means to make greater, esp. by addition from the outside:to augment one's income(by doing extra work).
    • 3.See corresponding entry in Unabridged expand, grow, develop, swell.
    • 6.See corresponding entry in Unabridged enlargement, expansion.
    • 1, 3.See corresponding entry in Unabridged decrease.

Collins Concise English Dictionary © HarperCollins Publishers::

increase vb /ɪnˈkriːs/
  1. to make or become greater in size, degree, frequency, etc; grow or expand
n /ˈɪnkriːs/
  1. the act of increasing; augmentation
  2. the amount by which something increases
  3. on the increaseincreasing, esp becoming more frequent
Etymology: 14th Century: from Old French encreistre, from Latin incrēscere, from in-² + crēscere to grow

inˈcreasable adj increasedly /ɪnˈkriːsɪdlɪ/, inˈcreasingly adv inˈcreaser n

'increase' also found in these entries:
Collocations: increase [sales, profit], a [tax, price] increase, increase [production, efficiency], more...

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