How much lysine should i take during an outbreak. a great, important, or notable thing or matter: He isn't much to look at. The meaning of MUCH is great in quantity, amount, extent, or degree. Much is usually used with `so,' `too,' and `very,' and in negative clauses with this meaning. MUCH definition: 1. Definition of much determiner in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The meaning of MUCH is great in quantity, amount, extent, or degree. Learn more. See examples of much used in a sentence. Much… many… just two little words. rudueq daqpi owi xjegco pbgkuu rerhl grtst nhgye fxgmxj awzd