| calculator | | |
| n. (person) | 1. calculator, computer, estimator, figurer, reckoner | an expert at calculation (or at operating calculating machines). |
| ~ expert | a person with special knowledge or ability who performs skillfully. |
| ~ adder | a person who adds numbers. |
| ~ number cruncher | someone able to perform complex and lengthy calculations. |
| ~ actuary, statistician | someone versed in the collection and interpretation of numerical data (especially someone who uses statistics to calculate insurance premiums). |
| ~ subtracter | a person who subtracts numbers. |
| n. (artifact) | 2. calculating machine, calculator | a small machine that is used for mathematical calculations. |
| ~ abacus | a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves. |
| ~ adder | a machine that adds numbers. |
| ~ adding machine, totaliser, totalizer | a calculator that performs simple arithmetic functions. |
| ~ tabulator, counter | a calculator that keeps a record of the number of times something happens. |
| ~ hand calculator, pocket calculator | a calculator small enough to hold in the hand or carry in a pocket. |
| ~ machine | any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks. |
| ~ napier's bones, napier's rods | a set of graduated rods formerly used to do multiplication and division by a method invented by John Napier. |
| ~ quipu | calculator consisting of a cord with attached cords; used by ancient Peruvians for calculating and keeping records. |
| ~ subtracter | a machine that subtracts numbers. |
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