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speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second c , light speed , speed of light
quality of wearisome constancy, routine, and lack of variety humdrum , monotony , sameness
constancy of tone or pitch or inflection monotony
freedom from wavering or indecision; constancy of resolve or conduct steadiness
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