'All' means the whole quantity or extent of something, or the greatest possible amount or degree of something. It can be used as a determiner, pronoun, or adverb, and is often used in phrases like 'all in all' and 'all of a sudden.' ALL definition: the whole of (used in referring to quantity, extent, or duration). See examples of all used in a sentence. n. The whole of one's fortune, resources, or energy; everything one has: The brave defenders gave their all. The meaning of ALL is the whole amount, quantity, or extent of. How to use all in a sentence. Synonym Discussion of All. Find 90 different ways to say ALL, along with antonyms, related words, and example sentences at Thesaurus.com. All means ‘every one’, ‘the complete number or amount’ or ‘the whole’. We use it most often as a determiner. We can use a countable noun or an uncountable noun after it: … When all refers to a whole class of people or things, we don’t use the: … So what's the difference? First you need to understand the difference between all and all the. We use all (without an article) when we're talking about the noun in general. All means ‘every one’, ‘the complete number or amount’ or ‘the whole’. We use it most often as a determiner. We can use a countable noun or an uncountable noun after it: … When all refers to a whole class of people or things, we don’t use the: … Some common synonyms of all are entire, total, and whole. While all these words mean including everything or everyone without exception, all may equal whole, entire, or total. Learn what all means with clear definitions, pronunciation, synonyms, and real-world examples. Simple explanations to help you use all correctly.