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I don't understand what this term means:

"Vinegar must not be less than 4% by mass acetic acid."

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I don't know where you found this quote but it means that vinegar, sold to the customer, must contain at leat 4 grams of acetic acid for each 96 grams of water. Does that help? I don't know if that is a FDA regulation or not.
thank you, i found this in my lab book.
I looked it up on an FDA site and found that vinegar MUST contain AT LEAST (it may contain more) 4% acid
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