Definitions

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

  • n. The period of time during which an individual is alive.
  • n. The period of time during which property, an object, a process, or a phenomenon exists or functions.
  • adj. Continuing for a lifetime; lifelong.
  • adj. Occurring or measured over a person's active career: a lifetime batting average.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The duration of the life of someone or something.
  • n. A long period of time.

from the GNU version of the Collaborative International Dictionary of English

  • n. The time that life continues.

from The Century Dictionary and Cyclopedia

  • n. The time that one's life continues; duration of life.

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

Etymologies

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