[syn: unintentionally, accidentally]
The Collaborative International Dictionary of English v.0.48:
Accidentally \Ac`ci*den"tal*ly\, adv.
In an accidental manner; unexpectedly; by chance;
unintentionally; casually; fortuitously; not essentially.
[1913 Webster]
WordNet (r) 3.0 (2006):
accidentally
adv 1: without advance planning; "they met accidentally" [syn:
by chance, accidentally, circumstantially,
unexpectedly] [ant: advisedly, by choice, by
design, deliberately, designedly, intentionally,
on purpose, purposely]
2: of a minor or subordinate nature; "these magnificent
achievements were only incidentally influenced by Oriental
models" [syn: incidentally, accidentally]
3: without intention; in an unintentional manner; "she hit him
unintentionally" [syn: unintentionally, accidentally]
[ant: advisedly, by choice, by design, deliberately,
designedly, intentionally, on purpose, purposely]