A division of a housing unit for use by relatives/friends of the primary residents, who would then usually share an entrance, and some shared space; but would be able to live separately, unlike boarders/roommates. There is no additional sound and fire separation as would be found in a multi-unit dwelling of separate apartments. The suite would contain at the least, sleeping, eating and bathing facilities.
Related
Similar words
granny suite
Origin
in-law + suite; from the primary users of such suites, in-laws
Modern English dictionary
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