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obstacle

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noun
  • something that impedes progress or achievement [Taisha]

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Wiktionary:
obstacle @ wiktionary
WordNet:
obstacle @ wordnet.princeton.edu
Merriam-Webster Online:
obstacle @ M-W.com
MSN Encarta:
obstacle @ Encarta
American Heritage Dictionary of the English Language:
obstacle @ AHD provided by Yahoo! Education
Answers.com:
obstacle @ Answers.com
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