say it: KAL-kyuh-lay-tur
calculator is a noun meaning "an expert at calculation (or at operating calculating machines)". It carries 2 recorded senses.
a small machine that is used for mathematical calculations; can be mechanical or electronic
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for calculator come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.