(in combinations such as 'as much', 'this much') Used to indicate, demonstrate or compare the quantity of something. You use much to indicate the great intensity, extent, or degree of something such as an action, feeling, or change. Much is usually used with 'so', 'too', and 'very', and in negative clauses with this meaning. 1. A large quantity or amount: Much has been written. 2. Something great or remarkable: The campus wasn't much to look at. The meaning of MUCH is great in quantity, amount, extent, or degree. How to use much in a sentence. MUCH definition: 1. a large amount or to a large degree: 2. a far larger amount of something than you want or need…. Learn more. Synonyms for MUCH: significant, important, major, big, historic, substantial, meaningful, eventful; Antonyms of MUCH: little, small, slight, trivial, minor, insignificant, unimportant, negligible Delve into the comprehensive meaning, definition, and fascinating etymology of much. This Self Exploration Academy glossary entry provides rich examples, usage nuances, and historical context for this essential English word. MUCH definition: great in quantity, measure, or degree. See examples of much used in a sentence. The term much comes from the Middle English word muchel or mochel, which originated from the Old English mycel, meaning great, big, or much. It is used to indicate a large amount or degree of something. Find 136 different ways to say MUCH, along with antonyms, related words, and example sentences at Thesaurus.com.