The word "greatest" is formed by combining the adjective "great" with the superlative suffix "-est".Great: This word has Old English origins, stemming from the Proto-Germanic grōtiz, meaning "great, big, strong". Its meaning and usage have evolved over time, but the core sense of largeness and importance has remained.-est: This is a common superlative suffix in English, indicating the highest degree or extent of a quality. It's a remnant of Old English grammar.Therefore, "greatest" signifies the highest degree of greatness, indicating something superior or exceeding all others.