Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The interval of time represented by a specific stratum of rock selected to be representative of all rocks formed during the same span of time.
  • noun The interval of time between two reversals of the Earth's magnetic polarity.

from The Century Dictionary.

  • noun An abbreviation of Chronicles.
  • noun Abbreviationsof chronological
  • noun of chronology.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology A period of time between two geomagnetic reversals.

Etymologies

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

[From Greek khronos, time.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Apparently from chrono-, perhaps for resonance with eon.

Examples

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