[*] 22. The inflection of Nouns, Adjectives, Pronouns, and Participles to denote gender, number, and case is called Declension, and these parts of speech are said to be declined. The inflection of Verbs to denote voice, mood, tense, number, and person is called Conjugation, and the verb is said to be conjugated.
[*] Note.--Adjectives are often said to have inflections of comparison. These are, however, properly stem-formations made by derivation (p. 55, footnote).