- calculator, reckoner, figurer, estimator, computer - an expert at calculation (or at operating calculating machines)
--1 is a kind of expert
--1 has particulars:adder; number cruncher; statistician, actuary; subtracter Derived form: verb reckon4 - reckoner, ready reckoner - a handbook of tables used to facilitate computation
--2 is a kind of handbook, enchiridion, vade mecum