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Definition of abacus:

  1. A board, tray, or table, divided into perforated compartments, for holding cups, bottles, or the like; a kind of cupboard, buffet, or sideboard.
  2. A calculating table or frame; an instrument for performing arithmetical calculations by balls sliding on wires, or counters in grooves, the lowest line representing units, the second line, tens, etc. It is still employed in China.
  3. A table or tray strewn with sand, anciently used for drawing, calculating, etc.
  4. A tablet, panel, or compartment in ornamented or mosaic work.
  5. The uppermost member or division of the capital of a column, immediately under the architrave. See Column.

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