Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A state of mental overactivity such as occurs in flights of ideas or in a manic episode.

from The Century Dictionary and Cyclopedia

  • n. Extreme mental excitement.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From the Greek hyper- (over) + -phren (mind, originally midriff, the supposed seat of the soul) + -ia (indicating a condition or quality).

Examples

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