WordReference Random House Learner's Dictionary of American English © 2017
im•prove /ɪmˈpruv/USA pronunciation   v.,  -proved, -prov•ing. 
  1. to (cause to) become better: [+ object]Exercise improves one's health.[no object]His health seems to be improving.
  2. to increase the value of (real property) by remodeling or adding features:[+ object]improved the property by remodeling the bathroom.
  3. improve on, [+ object] to produce something better than:tried to improve on my previous supervisor's work by adding to what she had started.
im•prov•a•ble, adj. See -prov-.

WordReference Random House Unabridged Dictionary of American English © 2017
im•prove  (im pro̅o̅v),USA pronunciation v.,  -proved, -prov•ing. 
  1. to bring into a more desirable or excellent condition:He took vitamins to improve his health.
  2. to make (land) more useful, profitable, or valuable by enclosure, cultivation, etc.
  3. to increase the value of (real property) by betterments, as the construction of buildings and sewers.
  4. to make good use of;
    turn to account:He improved the stopover by seeing a client with offices there.

  1. to increase in value, excellence, etc.;
    become better:The military situation is improving.
  2. to make improvements, as by revision, addition, or change:None of the younger violinists have been able to improve on his interpretation of that work.
im•prova•ble, adj. 
im•prov′a•bili•ty, im•prova•ble•ness, n. 
im•prova•bly, adv. 
im•proving•ly, adv. 
  • Late Latin prōde (est), by reanalysis of Latin prōdest (it) is beneficial, of use, with prōde taken as a neuter noun, nominal (compare proud); v by association with prove, approve
  • Anglo-French emprouer to turn (something) into profit, derivative of phrase en prou into profit, equivalent. to en (see en-1) + prou, Old French prou, preu
  • late Middle English improuen, emprouen 1425–75
    • 1.See corresponding entry in Unabridged amend, emend.
      Improve, ameliorate, better imply bringing to a more desirable state.
      Improve usually implies remedying a lack or a felt need:to improve a process, oneself(as by gaining more knowledge).
      Ameliorate, a formal word, implies improving oppressive, unjust, or difficult conditions:to ameliorate working conditions.To
      better is to improve conditions which, though not bad, are unsatisfying:to better an attempt, oneself( gain a higher salary).
    • 1, 5.See corresponding entry in Unabridged worsen.

Collins Concise English Dictionary © HarperCollins Publishers::

improve /ɪmˈpruːv/ vb
  1. to make or become better in quality; ameliorate
  2. (transitive) to make (buildings, land, etc) more valuable by additions or betterment
  3. (intr; usually followed by on or upon) to achieve a better standard or quality in comparison (with): to improve on last year's crop
Etymology: 16th Century: from Anglo-French emprouer to turn to profit, from en prou into profit, from prou profit, from Late Latin prōde beneficial, from Latin prōdesse to be advantageous, from pro-1 + esse to be

imˈprovable adj imˌprovaˈbility, imˈprovableness n imˈprovably adv imˈprover n imˈprovingly adv

'improve' also found in these entries:
Collocations: improve your [attitude, behavior], improve your [health, performance, skills], improve (their) [sales, profit], more...

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