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omen

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noun [countable] American English pronunciation: omen /ˈoʊmən/ 
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singularomen
pluralomens
  1. a sign that you believe shows whether good or bad things will happen in the future

    I hope the rainbow is an omen of what's to come.

    bad/good omen:

    He was convinced that seeing the black cat was a bad omen.

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