ef

Short definition from Wiktionary

Noun

1. 1
   The name of the Latin-script letter F/f.
2. 2
   Initialism of ejection fraction.
3. 3
   Initialism of electric field.

Conjunction

1. 1
   Pronunciation spelling of if, representing dialectal English.

Proper noun

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of Enhanced Fujita, a rating on the Enhanced Fujita scale used to indicate the intensity of a tornado; it has superseded the Fujita scale.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

Adjective

1. 1
   Initialism of extremely fine or extra fine; also XF.

Symbol

1. 1
   Symbol for exafarad, an SI unit of electrical capacitance equal to 10¹⁸ farads.