What is the definition of the word adverb in modern linguistics?
Modern linguists define the word adverb as a catch-all category for words that refuse to fit into other grammatical boxes like nouns, adjectives, or prepositions. This classification includes words with diverse syntactic behaviors that share little in common except their inability to be nouns, adjectives, or prepositions. The term functions as a dumping ground for words with diverse roles ranging from indicating manner, place, time, frequency, degree, or certainty to modifying entire clauses or sentences.