Medical Definition of saturation
1: the act of saturating : the state of being saturated
2: conversion of an unsaturated to a saturated chemical compound (as by hydrogenation)
3: a state of maximum impregnation; especially : the presence in air of the most water possible under existent pressure and temperature
4a: the one of the three psychological dimensions of color perception that is related to the purity of the color and that decreases as the amount of white present in the stimulus increases—called also intensity; compare brightness, hueb: degree of difference from the gray having the same lightness—used of an object color: degree of difference from the achromatic light-source color of the same brightness—used of a light-source color
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