(adv.) Toward the back or rear; backward.
(adv.) Behind; in the rear.
(adv.) Backward against the mast; - said of the sails when pressed by the wind.
(n.) An abacus.
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Webster, Noah. Entry for 'Aback'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/a/aback.html. 1828.