f — ODE · Shobdo

▸ abbreviation

1 Grammar feminine.

2 [in combination] (in units of measurement) femto- (10−15):

the detection limits of the enzymatic activity tests are between 10 and 500 fg per test.

3 (in textual references) folio.

4 Music forte.

5 (in racing results) furlong(s):

2 m 3 f.

6 Chemistry denoting electrons and orbitals possessing three units of angular momentum:

f-orbitals.

[ f from fundamental, originally applied to lines in atomic spectra]

▸ symbol

1 focal length. See also f-number:

apertures of f/5.6 to f/11.

2 Mathematics a function of a specified variable:

the value of f(x).

3 Electronics frequency.