Meanings
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1
adv
to what place or destination; where to
Whereto could the fugitives escape before nightfall?
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2
adv
to what thing, purpose, or end; to which
The agreement stated the duties whereto each officer was bound.
Thesaurus
Etymology
From Middle English wherto, a compound of where and to. It survives chiefly in archaic, literary, or formal language.