Adjective

• To form the positive, take the base (the word without the ending given), and add the endings corresponding to it's declension (for example, first declension adjectives would add -us for masculine, -a for feminine, or -um for neuter.)
• To form the comparitive, take the base and add -ior for masculine or feminine, or add -ius for neuter
• To form the superlative, take the base and add -issimus for masculine, -issima for feminine, and -issimum for neuter.

     mas         fem        neu
pos  altus       alta       altum       (high)
com  altior      altior     altium      (higher)
sup  altissimus  altissima  altissimum  (highest)

pos  fortis      fortis     forte       (strong}
com  fortior     fortior    fortium     (stronger)
sup  fortissimus fortissima fortissimum (strongest)

Ad"jec*tive (#), a. [See Adjective, n.]

1.

Added to a substantive as an attribute; of the nature of an adjunct; as, an word sentence.

2.

Not standing by itself; dependent.

Adjective color, a color which requires to be fixed by some mordant or base to give it permanency.

3.

Relating to procedure.

Macaulay.

© Webster 1913.

Ad"jec*tive, n. [L. adjectivum (sc. nomen), neut. of adjectivus that is added, fr. adjicere: cf. F. adjectif. See Adject.]

1. Gram.

A word used with a noun, or substantive, to express a quality of the thing named, or something attributed to it, or to limit or define it, or to specify or describe a thing, as distinct from something else. Thus, in phrase, "a wise ruler," wise is the adjective, expressing a property of ruler.

2.

A dependent; an accessory.

Fuller.

© Webster 1913.

Ad"jec*tive, v. t. [imp. & p. p. Adjectived (#); p. pr. & vb. n. Adjectiving (#).]

To make an adjective of; to form or change into an adjective.

Language has as much occasion to adjective the distinct signification of the verb, and to adjective also the mood, as it has to adjective time. It has . . . adjectived all three. Tooke.

© Webster 1913.