Webster’s Revised Unabridged Dictionary · 1913
Nominal
Nom′i·nal (nŏm′ĭ·nal), a. [L. nominalis, fr. nomen, nominis, name. See Name.] 1. Of or pertaining to a name or names; having to do with the literal meaning of a word; verbal; as, a nominal definition. Bp. Pearson.
2. Existing in name only; not real; as, a nominal difference. "Nominal attendance on lectures." Macaulay.
Nom′i·nal, n. 1. A nominalist. [Obs.] Camden.
2. (Gram.) A verb formed from a noun.
3. A name; an appellation.
A is the nominal of the sixth note in the natural diatonic scale. Moore (Encyc. of Music. )