"accidentally" in the adverb sense
1. by chance, accidentally, circumstantially, unexpectedly
without advance planning
"they met accidentally"
2. incidentally, accidentally
of a minor or subordinate nature
"these magnificent achievements were only incidentally influenced by Oriental models"
3. unintentionally, accidentally
without intention in an unintentional manner
"she hit him unintentionally"
Source: WordNet® (An amazing lexical database of English)
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