Webster
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Webster’s Revised Unabridged Dictionary · 1913

Datum

Da′tum (dā′tŭm), n.; pl. Data (#). [L. See 2d Date.] 1. Something given or admitted; a fact or principle granted; that upon which an inference or an argument is based; — used chiefly in the plural.

Any writer, therefore, who . . . furnishes us with data sufficient to determine the time in which he wrote. Priestley.

2. pl. (Math.) The quantities or relations which are assumed to be given in any problem.

Datum line (Surv.), the horizontal or base line, from which the heights of points are reckoned or measured, as in the plan of a railway, etc.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.