Skip to content
OneKitly

psi

nounsymbolattested in dialogue

  • //psaɪ//
  • //saɪ//

The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.

noun

  1. 1

    The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.

  2. 2

    A form of psychic energy.

    ‘Come, lad,’ he said. ‘We will take tea together and speak of the noumenon, the psi and other more heterogenous phenomena.’

    When an event is classified as a psi phenomenon, it is claimed that all known channels for the apparent interaction have been eliminated.

    It traces the growth of homo gestalt with the uniting of six lovely outcasts of society who have psi powers and come together as a hive mind, thus creating a gestalt super-being.

Etymology

From Middle English psi, from Latin psī, from Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).

symbol

  1. 1

    Pound per square inch (an imperial unit of pressure)

    For M2, this is typically around 3250 MPa (471,000 psi) when tempered at 300°F (149°C).

Etymology

Initialism of pounds per square inch.

Forms

plural
psis
The neighbouring pagesAlphabetical order follows the rules of the language, not byte values: an accent decides only between two otherwise identical words, and Spanish files Ñ as a letter of its own.

Lexical content from Wiktionary, under CC BY-SA 4.0 · Source entry · Data version 2026-08-23

Rank among the words of the OpenSubtitles 2018 corpus — film and television subtitles, so spoken rather than written usage (CC BY-SA 3.0).