1. (noun)calculator, reckoner, figurer, estimator, computer an expert at calculation (or at operating calculating machines) Synonyms: ready reckoner, information processing system, computer, computing machine, electronic computer, reckoner, calculator, computing device, calculating machine, figurer, data processor, estimator
2. (noun)reckoner, ready reckoner a handbook of tables used to facilitate computation Synonyms: reckoner, estimator, figurer, calculator, ready reckoner, computer