ef (plural efs)
The name of the Latin-script letter F.
ef
(nonstandard) Pronunciation spelling of if.
• F&E, FE, Fe, f.e.
EF (plural EFs)
(medicine, cardiology) Initialism of ejection fraction.
EF
(computing, Microsoft) Initialism of Entity Framework, an open-source ORM framework.
(Canada, US, meteorology) Followed by a number from 0 to 5: initialism of Enhanced Fujita, a rating on the Enhanced Fujita scale used to indicate the intensity of a tornado. It has superseded the Fujita scale.
EF (not comparable)
(philately) Initialism of extremely fine or extra fine; also XF.
• F&E, FE, Fe, f.e.
Source: Wiktionary
26 April 2025
(noun) generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature
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