1) Of, pertaining to, or constituting a name or names, a noun or nouns.
From L. nominalis "pertaining to a name or names," from nomen "name," cognate with Pers. nâm, as below.
Nâmin, from nâm, → name, + adj. suffix -in.
nominal focal length
derâzâ-ye kânuni-ye nâmin
Fr.: distance focale nominale
An approximate value of the → focal length, used for the classification of lenses, mirrors, or cameras, as opposed to the measured one.
Fr.: valeur nominale
The assigned, specified, or intended value of a quantity.