Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The amount by which something, especially a pollutant, exceeds a standard or permissible measurement.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An instance where an action, activity or substance exceeds a limit set by medical or legal practice.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. (geology) the probability that an earthquake will generate a level of ground motion that exceeds a specified reference level during a given exposure time

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