Etymology
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batman (n.)

"officer's servant," originally military title for "man in charge of a bat-horse and its load," 1755, from bat "pack-saddle" (late 14c.), from Old French bast (Modern French bât), from Late Latin bastum (see baton). Hence also batwoman (1941). The comic book hero dates from 1939.

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Definitions of batman

batman (n.)
an orderly assigned to serve a British military officer;
From wordnet.princeton.edu