Define much. much synonyms, much pronunciation, much translation, English dictionary definition of much. adj. more , most Great in quantity, degree, or extent: not. What does Much mean? Definition: great in quantity, amount, extent, or degree. Synonyms: big, consequential, earth-shattering, earthshaking, eventful, historic. Much is now generally used with uncountable nouns. The equivalent used with countable nouns is many. In positive contexts, much is widely avoided: I have a lot of money instead of I have much money. There are some exceptions to this, however: I have much hope for the future. A lot of these cases are emotive transitive verbs and nouns. I have much need for a new assistant. In parallel, I need. 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. Much definition: Great in quantity, degree, or extent. MUCH meaning: 1. a large amount or to a large degree: 2. a far larger amount of something than you want or need…. Learn more. The meaning of MUCH is great in quantity, amount, extent, or degree. How to use much in a sentence. MUCH definition: great in quantity, measure, or degree. See examples of much used in a sentence. Use the adjective much to mean a lot or a large amount. If you don't get much sleep the night before a big test, you don't get a lot. If you get too much sleep, you may sleep through your alarm and miss the test.