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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

reckoner

Noun

reck=on=er

WORDNET DICTIONARY

reckoner(n = noun.person) calculator, computer, estimator, figurer - an expert at calculation (or at operating calculating machines); Array

is a kind of expert

has particulars: adder, number cruncher, actuary, statistician, subtracter

Derived form verb reckon₄

reckoner(n = noun.communication) ready reckoner - a handbook of tables used to facilitate computation; Array

is a kind of enchiridion, handbook, vade mecum

reckoner, n.

One who reckons or computes; also, a book of calculations, tables, etc., to assist in reckoning. [1913 Webster]

"Reckoners without their host must reckon twice." [1913 Webster]

reckoner, n. = ready reckoner.

For further exploring for "reckoner" in Webster Dictionary Online