Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The length of time for which an organism lives.
  • n. The length of time for which something exists or is current or valid.

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

  • n. the period during which something is functional (as between birth and death)

Etymologies

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