Adjective - Wikipedia
https://en.wikipedia.org/wiki/AdjectiveAdjective comes from Latin nōmen adjectīvum, a calque of Ancient Greek: ἐπίθετον ὄνομα, romanized: epítheton ónoma, lit. 'additional noun'. In the grammatical tradition of Latin and Greek, because adjectives were inflected for gender, number, and case like nouns (a process called declension), they were considered a type of noun. The words that are today typically called nouns were then called substantivenouns (nōmen substantīvum). The terms noun substantive and nou…