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单词 reckoner
释义

WordReference Random House Unabridged Dictionary of American English © 2024
reck•on•er  (rekə nər),USA pronunciation n. 
  1. a person who reckons.
  2. MathematicsAlso called ready reckoner. a collection of mathematical and other tables for ready calculation.
  • 1175–1225; Middle English; see reckon, -er1

Collins Concise English Dictionary © HarperCollins Publishers::
reckoner /ˈrɛkənə/ n
  1. any of various devices or tables used to facilitate reckoning, esp a ready reckoner
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