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abacus noun

  /əˈbakəs/ , /ˈæbəkəs/
  • A device used for performing arithmetical calculations; (rare) a table on which loose counters are placed, or (more commonly) an instrument with beads sliding on rods, or counters in grooves, with one row of beads or counters representing units, the next tens, etc. [from late 17th c.]
 abakas
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