ef

plural efs · alternative eff

1. The name of the Latin script letter F/f.

   I have drunk en-ee-cee-tee-ay-ar from the ef-ell-oh-doubleyou-ee-ar-ess in his gee-ay-ar-dee-ee-en many a time.

   2004, Will Rogers, The Stonking Steps, page 170

alternative eff

1. nonstandardpronunciation spellingPronunciation spelling of if, representing dialectal English.

   Captain Tom would have hired him to hunt down his own child, ef Rosebud hadn’t interfered.

   1882, James Jackson, Tom Terror, the Outlaw

plural EFs

1. abbreviationinitialismcardiologyInitialism of ejection fraction.
2. abbreviationinitialismbusinessInitialism of electric field.

   1 more example

   Under certain conditions, the localized EF near an energized transmission line conductor can produce small electric discharges, ionizing nearby air. […] Modern “bipolar” cardiac devices are much less susceptible to interactions with EFs. Manufacturers of pacemakers and other IMDs have indicated that EFs below 6 kV/m are unlikely to cause interactions affecting the operation of most of their devices.

   2024 August 19, “LAKETOWN 115-kV TRANSMISSION LINE PROJECT IN CARVER COUNTY, MN”, in Great River Energy, pages 55, 74

1. abbreviationinitialismcomputingInitialism of Entity Framework, an open-source ORM framework.
2. CanadaUSclimatologyFollowed 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of Enhanced Fujita, a rating on the Enhanced Fujita scale used to indicate the intensity of a tornado; it has superseded the Fujita scale.
3. abbreviationinitialismCatholicismInitialism of Extraordinary Form.

1. abbreviationinitialismnot comparablehobbiesInitialism of extremely fine or extra fine; also XF.