datum
Speech parts
1. datum - Noun
2. datum - Verb
Meaning
Something given or admitted; a fact or principle granted; that upon which an inference or an argument is based; -- used chiefly in the plural.
The quantities or relations which are assumed to be given in any problem.
Source: Webster's dictionarySynonyms
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Examples
It can scarcely be denied that the supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience.
Knowledge is invariably a matter of degree: you cannot put your finger upon even the simplest datum and say this we know.
NOTHING IS TRUE. EVERYTHING IS PERMITTED. A decade on and the rest of the page remains blank for we still cannot find a single datum that remains true under all possible circumstances, nor evidence of the impossibility of anything under all possible circumstances. But by all means have a go....
A datum transformation again is referred to by ISO as a coordinate transformation.
As of 17 September 2007 the PZ-90 datum has been updated to version PZ-90.02 which differ from WGS 84 by less than convert in any given direction.
As a general definition, altitude is a distance measurement, usually in the vertical or "up" direction, between a reference datum and a point or object.