Pronunciation: /əˈbæk.aɪ/
noun a plural form of the noun abacus, which is a calculating tool used for arithmetic calculations
A1 Abaci are ancient counting tools.
A2 The abaci were used by merchants in the past to calculate sums.
B1 Students in the math class were learning how to use abaci.
B2 The abaci is a versatile tool that can be used for various calculations.
C1 The abaci has been replaced by modern calculators in most educational settings.
C2 Historians study the evolution of abaci in different cultures throughout history.
formal The student used abaci to solve complex mathematical problems in the classroom.
informal I found some old abaci in my grandparents' attic.
slang Hey, check out these cool abaci I found at the flea market!
figurative The abaci of history continue to shape our understanding of the past.
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