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Noun improvement has 3 senses
  1. improvement - the act of improving something; "their improvements increased the value of the property"
    --1 is a kind of
    change of state
    --1 has particulars:
     tenderization, tenderisation; development; cleaning, cleansing, cleanup; correction, rectification; optimization, optimisation; perfection; reform; amelioration, melioration, betterment; self-improvement, self-reformation; clearing, clarification; enrichment; humanization, humanisation; modernization, modernisation; renovation, redevelopment; enhancement, sweetening; upturn; ventilation, airing; repair, fix, fixing, fixture, mend, mending, reparation; stabilization, stabilisation; upgrade
    Derived form: verb improve1
  2. improvement, betterment, advance - a change for the better; progress in development
    --2 is a kind of transformation, transmutation, shift
    --2 has particulars:
     revival, resurgence, revitalization, revitalisation, revivification; refinement, elaboration; adjustment, accommodation, fitting; conservation, preservation; recovery
    Derived form: verb improve2
  3. improvement, melioration - a condition superior to an earlier condition; "the new school represents a great improvement"
    --3 is a kind of condition, status
    Antonyms: decline, declination
    --3 has particulars:
     betterment; development; reformation; renovation, restoration, refurbishment
    Derived form: verb improve2
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