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1. Oxford American Dictionary

   reckoner

   • IPA[ˈrek(ə)nər]

   美式

   • n.
     a table or device designed to assist with calculation

   • noun: reckoner, plural noun: reckoners

2. • 釋義

   n.

   名詞

   • 1. a table or device designed to assist with calculation income and spending reckoners to help with your calculations