Etymology
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accidentally (adv.)

late 14c., "non-essentially," also "unnaturally," from accidental (adj.) + -ly (2). Meaning "unintentionally" is recorded from 1580s; phrase accidentally on purpose is recorded from 1799.

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Definitions of accidentally

accidentally (adv.)
without advance planning;
they met accidentally
Synonyms: by chance / circumstantially / unexpectedly
accidentally (adv.)
of a minor or subordinate nature;
Synonyms: incidentally
accidentally (adv.)
without intention; in an unintentional manner;
Synonyms: unintentionally
From wordnet.princeton.edu