psi.
The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
Meaning & usage
The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
A form of psychic energy.
Where this word comes from
From Middle English psi, from Latin psī, from Ancient Greek ψεῖ (pseî), the name for the twenty-third letter of the alphabet (Ψ, ψ).
Pound per square inch (an imperial unit of pressure)
Where this word comes from
Initialism of pounds per square inch.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.