Definitions

from The Century Dictionary.

  • noun The state of being adult or completely developed: as, in full vigor and adulthood.

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

  • noun The time of life when one is expected to take responsibility for one's own actions and well-being.

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

  • noun the state (and responsibilities) of a person who has attained maturity
  • noun the period of time in your life after your physical growth has stopped and you are fully developed

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From adult +‎ -hood

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