English

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Etymology 1

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From un- +‎ stamped.

Adjective

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unstamped (not comparable)

  1. Not stamped.
    • 2007 January 4, Brenda Goodman, “Tennessee’s Tax on Illegal Drugs Nets $3.5 Million”, in New York Times[1]:
      The real money the law generates comes from penalties assessed on people caught with unstamped drugs.

Etymology 2

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Verb

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unstamped

  1. simple past and past participle of unstamp