abacus
Americannoun
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a device for making arithmetic calculations, consisting of a frame set with rods on which balls or beads are moved.
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Architecture. a slab forming the top of the capital of a column.
noun
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a counting device that consists of a frame holding rods on which a specific number of beads are free to move. Each rod designates a given denomination, such as units, tens, hundreds, etc, in the decimal system, and each bead represents a digit or a specific number of digits
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architect the flat upper part of the capital of a column
Other Word Forms
Etymology
Origin of abacus
1350–1400; Middle English < Latin: board, counting board, re-formed < Greek ábax
Explanation
An abacus is an ancient tool used for calculating that remains popular in some places even today. Some sort of counter (beads, beans, stones) is moved in a groove or on a wire to represent the different numbers in the equation. Abacus is a Latin word from a Greek word abax, which meant "counting table." The original abaci were created in sand. The plural abacuses can also be used. In architecture, an abacus can also refer to a flat slab that sits on top of the broad part of a pillar or column (called the capital) to help support a beam (called an architrave) that rests across several pillars.
Vocabulary lists containing abacus
The Westing Game
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"Love's Vocabulary," Vocabulary from the essay
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The Night Diary
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
That speech raised his profile both abroad and at home, said David Coletto, a Canadian pollster and CEO of Abacus Data.
From BBC • Apr. 26, 2026
In addition to Jetro Holdings, Kirsh’s investment portfolio includes a London skyscraper called Tower 42 and Australian real-estate company Abacus Property Group.
From The Wall Street Journal • Mar. 30, 2026
Ultimately, Bell Media opted against a co-financier, instead covering the remaining costs through its new distribution branch, Sphere Abacus.
From Los Angeles Times • Feb. 3, 2026
“You can always decide to go from an inherited spouse IRA to your own IRA down the road,” Stephen Maggard, a certified financial planner at Abacus Planning Group.
From MarketWatch • Nov. 1, 2025
Abacus, a square tablet which crowns the capital of the column.
From Architecture Classic and Early Christian by Smith, T. Roger (Thomas Roger)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
