A place or space designated for or associated with aunts; an auxiliary or supportive space (rare or constructed term).
From 'aunt' plus the suffix '-ary' (from Latin '-arius' meaning 'related to' or 'connected with'), similar to words like 'library,' 'dictionary,' and 'secondary', which form nouns for places or collections.
The '-ary' suffix is incredibly productive in English for creating nouns of places and things—'library' (book place), 'aviary' (bird place), 'mortuary' (death place)—and would theoretically work for 'auntsary' (aunt place).
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