This document defines and provides examples of various types of adjectives meanings: 1. Synonyms are words with the same or similar meanings, so replacing a word in a sentence with a synonym does not change the literal meaning. 2. Antonyms are words with opposite meanings, which can be complementary (no scale, one or the other), gradable (on a scale), or converse (relational pairs). 3. Meaning postulates integrate word meanings into logical systems using if-then statements. 4. Adjectives modifying nouns combine the meaning of the adjective and noun into a single phrase.