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Words, grammatical forms and meanings linked to the ontology.

psi en · NOUN · etymology 1

Pronunciation

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).

Meanings

  1. (countable) The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
  2. (uncountable) A form of psychic energy.
    • When an event is classified as a psi phenomenon, it is claimed that all known channels for the apparent interaction have been eliminated. 1996, Michael F. Stoeber, Hugo Anthony Meynell, Critical Reflections on the Paranormal (page 60)
    • 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. 2005, Michael Ashley, Transformations: The History of the Science Fiction Magazine 1950 to 1970, Liverpool: Liverpool University Press, page 133:
    • ‘Come, lad,’ he said. ‘We will take tea together and speak of the noumenon, the psi and other more heterogenous phenomena.’ 1993, Will Self, My Idea of Fun:

Forms

SpellingFeaturesLabelsSource
psis Number=Plur lexicographic

Deriveds

psi function · psivamp · psi particle

Translations (28)

grc ψεῖ (Greek letter) · ar پْسِي (Greek letter) · ja プスィ (Greek letter) · ms psi (Greek letter) · fr psi (Greek letter) · cmn 普西 (Greek letter) · ja プシー (Greek letter) · es psi (Greek letter) · de Psi (Greek letter) · fa سای (Greek letter) · ru пси (Greek letter) · hu pszi (Greek letter) · it psi (Greek letter) · fi psii (Greek letter) · ar بْسِي (Greek letter) · nl psi (Greek letter) · ca psi (Greek letter) · he פְּסִי (Greek letter) · ia psi (Greek letter) · eo psio (Greek letter) · ko 프시 (Greek letter) · el ψι (Greek letter) · pl psi (Greek letter) · ast psi (Greek letter) · ja プサイ (Greek letter) · ga(Greek letter) · pt psi (Greek letter) · cs psí (Greek letter)

Source: en.wiktionary, “psi” (noun), dump 20260902, contributors via the page history. Text licensed CC BY-SA 4.0.

psi en · SYM · etymology 2

Etymology

Initialism of pounds per square inch.

Meanings

  1. Pound per square inch (an imperial unit of pressure)
    • Each turbogenerator consisted of a steam turbine, powered by 900 psi of superheated steam, that was coupled by a set of reduction gears to a General Electric marine alternating-current generator operating at 1,800 rpm. Each generator had a capacity of 2,000 kilowatts of three-phase power at 450 volts and 60 hertz. The main 450-volt switchboard was energized by the two turbogenerators. The emergency switchboard, in the emergency generator room, was fed from the main switchboard through an electrical tie. 2017 December 12, National Transportation Safety Board, “1.3.5 Electrical Generation and Distribution System”, in Marine Accident Report: Sinking of US Cargo Vessel SS El Faro, Atlantic Ocean, Northeast of Acklins and Crooked Island, Bahamas, October 1, 2015, archived from the original on 15 May 2022, pages 36–37:
    • For M2, this is typically around 3250 MPa (471,000 psi) when tempered at 300°F (149°C). 2024 March 23, “Yield Strength of Steel: A Comprehensive Guide”, in Unionfab, archived from the original on 13 Jan 2026:

Forms

SpellingFeaturesLabelsSource
PSI alternative lexicographic
P.S.I. alternative lexicographic

Relateds

psia