"in what place," early 15c., from whereabout + adverbial genitive -s. The noun, "place where someone or something is," is recorded from 1795. Whereabout in this sense is from c. 1600.
I questioned him about his whereabouts on the night of the crime
whenas
whence
whenever
where
whereabout
whereabouts
whereas
whereat
whereby
wherefore
wherein
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