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abacus

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abacus/ˈæbəkəs/noun
pluralabacusesalsoabaci/-ˌsaɪ//ˈæbəˌsaɪ/
abacus
/ˈæbəkəs/
noun
pluralabacusesalsoabaci/-ˌsaɪ//ˈæbəˌsaɪ/
Learner's definition of ABACUS  
[count]
: a device used for counting and calculating by sliding small balls or beads along rods or in grooves
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