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URLﾘﾝｸ(dictionary.cambridge.org)
Cambridge Dictionary English Grammar Today
All as a determiner
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:
All my friends are away at university.
All tickets cost 25 pounds.
All information about the new product is confidential.