PSI
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psi¹
- /psaɪ/
- /saɪ/
Sounds like xi, sigh, scye, sai, Si (all for the latter pronunciation only), Si · Rhymes with -aɪ
Where it 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).
noun psis
- The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
- 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.’
psi²
Where it comes from
Initialism of pounds per square inch.
symbol P.S.I. · PSI
- 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 volt
PSI³
noun
- Initialism of pre-sentence investigation.pre-sentence investigation
- Initialism of protein structure initiative.protein structure initiative
- Initialism of pollutant safety/standard index (measurement of the air pollutant such as haze).pollutant safety/standard index
proper noun
- Initialism of Policy Studies Institute, a British think tank.Policy Studies Institute
