Definitions from Wiktionary (add on)

▸ verb:  (transitive) To incorporate (something extra, often an amount of money) into something else (often a bill).
▸ verb:  (intransitive) To put an expansion (addition) onto a building, usually a home.
▸ noun:  Alternative form of add-on [(sometimes attributive) Something which can be appended to something else.]
▸ Also see add_on

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