Definition of psychoactivity in English:

psychoactivity

Pronunciation /ˌsʌɪkəʊakˈtɪvɪti/ /ˌsʌɪkəʊəkˈtɪvɪti/

noun

  • 1rare In form psycho-activity. Mental activity.

  • 2The action or effect of a psychoactive drug on the brain.

Origin

Late 19th century; earliest use found in Mind. From psycho- + activity.