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Definition psi

Etymology 1

From Ancient Greek ψῖ (psî), the name for the twenty-third letter of the alphabet (Ψ, ψ).

Noun

psi (countable and uncountable, plural psis)

  1. (countable) The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
  2. (uncountable, parapsychology) A form of psychic energy.

Etymology 2

Initialism

Try searching for words with the letters PSI, words with the phrase PSI, words starting with the letters PSI, or words ending in the letters PSI.