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. [ 1913 Webster ]

2. Existing in name only; not real; as, a nominal difference. “Nominal attendance on lectures.” Macaulay. [ 1913 Webster ]

4. Hence: Insignificant; trifling; -- of prices or costs, as compared with the benefits gained; as, to pay a nominal sum for the data; a nominal fee. [ PJC ]

3. Within acceptable limits; as expected; as, the hydraulic lines are at nominal pressure; -- used mostly in aviation and space operations. [ PJC ]

n. 1. A nominalist. [ Obs. ] Camden. [ 1913 Webster ]

2. (Gram.) A verb formed from a noun. [ 1913 Webster ]

3. A name; an appellation. [ 1913 Webster ]

A is the nominal of the sixth note in the natural diatonic scale. Moore (Encyc. of Music. ) [ 1913 Webster ]

n. The principles or philosophy of the Nominalists. [ 1913 Webster ]

n. (Metaph.) One of a sect of philosophers in the Middle Ages, who adopted the opinion of Roscelin, that general conceptions, or universals, exist in name only. Reid. [ 1913 Webster ]

a. Of or pertaining to the Nominalists. [ 1913 Webster ]

v. t. (Grammar, Linguistics) To convert into a noun; as, a nominalized sentence; a nominalized adjective or verb. [ 1913 Webster ]

In a sentence of the form:
“That Kennedy would have been a great president if he had not been assassinated is one of the enduring myths of the Camelot conceit.”
the sentence “Kennedy would have been a great president if he had not been assassinated” has been nominalized by the introductory “that”. [ PJC ]

adv. In a nominal manner; by name; in name only; not in reality. Burke. [ 1913 Webster ]