Learn the meaning and usage of the word stuff in different contexts, such as a noun, a verb, or an exclamation. Find out the synonyms, pronunciation, and related expressions of stuff in British and American English. Definition of stuff noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Learn the meaning of stuff as a noun and a verb in English, with synonyms, idioms, and usage examples. Stuff can refer to a substance, a thing, a quality, or an action, depending on the context. "Stuff" can mean almost anything that isn't singular. It's a very useful and common word, so it's important to understand its meaning clearly.