to introduce one or more groups into (a compound).
to become acetylated.
Historical Examples

The furfural constants of the lignocellulose are unaffected by the acetylation and condensation.
Researches on Cellulose C. F. Cross

(transitive) to introduce an acetyl group into (a chemical compound)
(intransitive) (of a chemical compound) to gain or suffer substitution of an acetyl group

acetylation a·cet·y·la·tion (ə-sět’l-ā’shən)
A reaction, usually with acetic acid, that introduces an acetyl radical into an organic compound.

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