world point

world point

noun Physics.
(in relativity) a point in space-time, specified by three space coordinates and a time coordinate. Compare event (def. 4).

Origin:
1920–25
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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World point is always a great word to know.
So is base unit. Does it mean:
pertaining to a mass of radioactive material in which the rate of a chain reaction increases with time
one of the units, as mass, length, time, or electric current, taken as a basis for a system of units in the sciences
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