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ap·prox·i·ma·tion

approximation

pronunciation:
prak s meI shn
part of speech: noun
definition 1: the act of approximating.
The figures were attained by approximation.
similar words:
approach
definition 2: an estimate; guess.
Her approximation of the depth of the lake was quite close to the actual figure.
similar words:
idea
definition 3: a mathematical or scientific result that is within acceptable limits of accuracy.