Etymology
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duchy (n.)

mid-14c., "territory ruled by a duke or duchess," from Old French duché (12c.), from Medieval Latin ducatus "territory of a duke," from Latin dux "leader" (see duke (n.)).

updated on October 12, 2018

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Definitions of duchy from WordNet

duchy (n.)
the domain controlled by a duke or duchess;
Synonyms: dukedom
From wordnet.princeton.edu, not affiliated with etymonline.