ef

noun

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.”

2. (abbreviation, alt-of, initialism)Initialism of ejection fraction.
3. (abbreviation, alt-of, initialism)Initialism of electric field.

   “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.”

conj

1. (alt-of, nonstandard, pronunciation-spelling)Pronunciation spelling of if, representing dialectal English.

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

name

1. (abbreviation, alt-of, initialism)Initialism of Entity Framework, an open-source ORM framework.
2. (Canada, US)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of Enhanced Fujita, a rating on the Enhanced Fujita scale used to indicate the intensity of a tornado; it has superseded the Fujita scale.
3. (abbreviation, alt-of, initialism)Initialism of Extraordinary Form.

adj

1. (abbreviation, alt-of, initialism, not-comparable)Initialism of extremely fine or extra fine; also XF.