noun aba·cus \ˈa-bə-kəs, ə-ˈba-\

: a device used for counting and calculating by sliding small balls or beads along rods or in grooves

plural aba·ci \ˈa-bə-ˌsī, -ˌkē; ə-ˈba-ˌkī\ or aba·cus·es

Full Definition of ABACUS

:  an instrument for performing calculations by sliding counters along rods or in grooves
:  a slab that forms the uppermost member or division of the capital of a column

Illustration of ABACUS

Origin of ABACUS

Latin, from Greek abak-, abax, literally, slab
First Known Use: 14th century

Other Mathematics and Statistics Terms

abscissa, denominator, divisor, equilateral, exponent, hypotenuse, logarithm, oblique, radii, rhomb
ABACUS Defined for Kids


noun aba·cus \ˈa-bə-kəs\
plural aba·ci \ˈa-bə-ˌsī\ or aba·cus·es

Definition of ABACUS for Kids

:  an instrument for doing arithmetic by sliding counters along rods or in grooves


Next Word in the Dictionary: AbaddonPrevious Word in the Dictionary: abaculusAll Words Near: abacus
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears