WordReference Random House Learner's Dictionary of American English © 2019
im•prove•ment /ɪmˈpruvmənt/USA pronunciation   n. 
  1. an act of improving or the state of being improved:[uncountable]signs of economic improvement.
  2. a change or addition by which a thing is improved:[countable]to make improvements on a house.
See -prov-.
WordReference Random House Unabridged Dictionary of American English © 2019
im•prove•ment  (im pro̅o̅vmənt),USA pronunciation n. 
  1. an act of improving or the state of being improved.
  2. a change or addition by which a thing is improved.
  3. a person or thing that represents an advance on another in excellence or achievement:The new landlord is a great improvement over his greedy predecessor.
  4. a bringing into a more valuable or desirable condition, as of land or real property;
  5. something done or added to real property that increases its value.
  6. profitable use, as of a period of time.
  • Anglo-French emprouement something profitable (especially exploitation of land). See improve, -ment
  • late Middle English improuement 1400–50
    • 3.See corresponding entry in Unabridged refinement, betterment, advancement.
    • 4.See corresponding entry in Unabridged enhancement, repair.

Collins Concise English Dictionary © HarperCollins Publishers::

improvement /ɪmˈpruːvmənt/ n
  1. the act of improving or the state of being improved
  2. something that improves, esp an addition or alteration
  3. (usually plural) Austral NZ a building or other works on a piece of land, adding to its value

'improvement' also found in these entries:
Collocations: [massive, minor, drastic, new] improvements, a home improvement [loan, contractor], make [household, home] improvements, more...

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