psi
/psaɪ/
Word Rarity
Rare
Frequency: Zipf frequency 3.45 in modern English
5
Scrabble Score
3
Letters
1
Syllables
3
Unique Chars
Meaning
noun
The twenty-third letter of Classical and Modern Greek and the twenty-fifth letter of Old and Ancient Greek.
Countable
symbol
Pound per square inch (an imperial unit of pressure)
noun
Initialism of pre-sentence investigation.
noun
noun
Initialism of pollutant safety/standard index (measurement of the air pollutant such as haze).
Example Sentences
- "‘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."
- "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."
- "For M2, this is typically around 3250 MPa (471,000 psi) when tempered at 300°F (149°C)."
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).
Origin
Word Breakdown
- Root: psi, psī, ψεῖ
Usage
- Countable
- Uncountable
- British usage
Inflected Forms
psis (plural)
P.S.I. (alternative)