An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1) Of, pertaining to, or constituting a name or names, a noun or nouns.
2) Describing a value quoted for commodity, expectation, or its current estimate, as opposed to the actual value. → nominal value.
3) Within acceptable limits; as expected.
4) a) Grammar: Relating to a noun or to any word or word group that functions as a noun. b) A word which differs from a noun but functions as one.

From L. nominalis "pertaining to a name or names," from nomen "name," cognate with Pers. nâm, as below.

Nâmenâl, from nâmen, from O.Pers./Av.nâman-, → name, + suffix -al.

An approximate value of the → focal length, used for the classification of lenses, mirrors, or cameras, as opposed to the measured one.

→ nominal; → focal; → length.

The assigned, specified, or intended value of a quantity.

→ nominal; → value.