happening by chance or accident; not planned; unexpected: an accidental meeting.
nonessential; incidental; subsidiary: accidental benefits.
Music. relating to or indicating sharps, flats, or naturals.
a nonessential or subsidiary circumstance, characteristic, or feature.
Music. a sign placed before a note indicating a chromatic alteration of its pitch.

1350–1400; Middle English < Medieval Latin accidentālis. See accident, -al1

accidentally, accidently, adverb
accidentalness, accidentality, noun
nonaccidental, adjective, noun
nonaccidentally, adverb
nonaccidentalness, noun
preaccidental, adjective
preaccidentally, adverb
pseudoaccidental, adjective
pseudoaccidentally, adverb
quasi-accidental, adjective
quasi-accidentally, adverb
unaccidental, adjective
unaccidentally, adverb

1. unintentional, unforeseen. Accidental, casual, fortuitous all describe something outside the usual course of events. Accidental implies occurring unexpectedly or by chance: an accidental blow. Casual describes a passing event of slight importance: a casual reference. Fortuitous is applied to events occurring without known cause, often of a fortunate or favorable nature: a fortuitous shower of meteors. It often also implies good luck or good fortune: a fortuitous choice leading to rapid advancement.

1. planned, contrived. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To accidently
World English Dictionary
accidental (ˌæksɪˈdɛntəl)
1.  occurring by chance, unexpectedly, or unintentionally
2.  nonessential; incidental
3.  music denoting sharps, flats, or naturals that are not in the key signature of a piece
4.  logic (of a property) not essential; contingent
5.  an incidental, nonessential, or supplementary circumstance, factor, or attribute
6.  music a symbol denoting a sharp, flat, or natural that is not a part of the key signature

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Those answers flopped not because you accidently trampled someone's personal pixie, but because they were crappy answers.
Do you write long tomes to show your depth intellect or increase the probability that you may accidently type a keen insight.
We were putting it all over our bodies and were accidently throwing it on each other.
She gets a chance to win him after she accidently breaks her crippled leg.
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