From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. The act of making profitable use or applicaton of anything, or the state of being profitably employed; a turning to good account; practical application, as of a doctrine, principle, or theory, stated in a discourse. ''A good improvement of his reason.'' --S. Clarke.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
132 Moby Thesaurus words for "improvement": about-face, accommodation, adaptation, adjustment, advance, alteration, amelioration, amendment, apostasy, apprenticeship, basic training, betterment, break, breaking, breeding, change, change of allegiance, change of heart, change of mind, changeableness, conditioning, constructive change, continuity, convalescence, conversion, cultivation, defection, degeneration, degenerative change, deterioration, development, deviation, difference, discipline, discontinuity, divergence, diversification, diversion, diversity, drill, drilling, enhancement, exercise, fetching-up, fitting, flip-flop, fostering, gain, gradual change, grooming, housebreaking, in-service training, increase, instauration, manual training, melioration, military training, mitigation, modification, modulation, new birth, nurture, nurturing, on-the-job training, overthrow, practice, preparation, progress, qualification, radical change, raising, re-creation, reactivation, readying, realignment, rearing, rebirth, reclamation, reconstitution, reconversion, recovery, recrudescence, recuperation, redemption, redesign, redintegration, reenactment, reestablishment, reform, reformation, regeneration, rehabilitation, rehearsal, reinstatement, reinstation, reinstitution, reinvestiture, reinvestment, remaking, renascence, renewal, repair, replacement, reshaping, restitution, restoration, restructuring, reversal, reversion, revival, revivification, revolution, rise, shift, sloyd, sudden change, switch, total change, training, transition, turn, turnabout, upbringing, upgrading, upheaval, upswing, variation, variety, violent change, vocational education, vocational training, worsening
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