from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To diminish or impair in quality, character, or value: Time and neglect had deteriorated the property.
- intransitive v. To grow worse; degenerate: The weather deteriorated overnight. His health had deteriorated while he was in prison.
- intransitive v. To weaken or disintegrate; decay: The nation's highways are deteriorating at a rapid pace.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To make worse; to make inferior in quality or value; to impair.
- v. To grow worse; to be impaired in quality; to degenerate.
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To make worse; to make inferior in quality or value; to impair.
- intransitive v. To grow worse; to be impaired in quality; to degenerate.
from The Century Dictionary and Cyclopedia
- To make worse; reduce in quality; lower the essential character or constitution of: as, to deteriorate a race of men or their condition.
- To grow worse; be or become impaired in quality; degenerate.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. grow worse
- v. become worse or disintegrate
Late Latin dēteriōrāre, dēteriōrāt-, from Latin dēterior, worse; see de- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)