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Explanation: I assume you're familiar with epoxy adhesives (like Araldite, which you can buy in the UK), where you have to mix two chemicals together to form a glue that gradually sets hard.
Well this term refers to an adhesive where two (or more) compounds combine in a reaction that involves the elimination of acetic acid groups (-C2H2COOH) from one or more of these compounds. The acetic acid is then either left as a by-product, or neutralized by some other compound added to the mixture.