ready reckoner

== English == === Alternative forms === ready-reckoner === Etymology === Coined by English grammarian and textbook writer Daniel Fenning in 1757. === Noun === ready reckoner (plural ready reckoners) (historical) A printed book or table containing precalculated values, often multiples of given amounts. A computer program which calculates values; an online calculator. === See also === === Further reading === ready reckoner on Wikipedia.Wikipedia