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1. Occurring unexpectedly, unintentionally, or by chance.
2. Music Of or relating to an accidental.
3. Being an animal, especially a bird, that has strayed beyond its normal range.
1. A property, factor, or attribute that is not essential.
2. Music
a. Any of various signs that indicate the alteration of a note by one or two semitones or the cancellation of a previous sign.
b. A note that has been marked with such a sign.
3. An animal that has strayed beyond its normal range.

ac′ci·den′tal·ly, ac′ci·dent′ly adv.
Synonyms: accidental, fortuitous, contingent, incidental
These adjectives apply to what happens unintentionally. Accidental primarily refers to what occurs by chance: an accidental meeting.
It can also mean subordinate or nonessential: "Poetry is something to which words are the accidental, not by any means the essential form" (Frederick W. Robertson).
Fortuitous stresses chance even more strongly: "the happy combination of fortuitous circumstances" (Sir Walter Scott).
Contingent describes what is possible but uncertain because of unforeseen or uncontrollable factors: "The results of confession were not contingent, they were certain" (George Eliot).
Incidental refers to a minor or unanticipated result or accompaniment: "There is scarcely any practice which is so corrupt as not to produce some incidental good" (Enoch Mellor).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


a variant (now obsolete) of accidentally
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in classic literature ?
But one day they accidently met at his bedside while he slept, and the truth coming out a violent quarrel ensued.
This suspicion was given by some words which accidently dropped from him one evening at the park, when they were sitting down together by mutual consent, while the others were dancing.
I know he did not mean to say it, but it came out accidently."
But if my heart had not been engaged, she, into whose company I accidently fell at that cursed place, was not an object of serious love.
At last, the Dodger trod upon his toes, or ran upon his boot accidently, while Charley Bates stumbled up against him behind; and in that one moment they took from him, with the most extraordinary rapidity, snuff-box, note-case, watch-guard, chain, shirt-pin, pocket-handkerchief, even the spectacle-case.
If anybody had asked Amy what the greatest trial of her life was, she would have answered at once, "My nose." When she was a baby, Jo had accidently dropped her into the coal hod, and Amy insisted that the fall had ruined her nose forever.
It was very soon discovered that whoever cast an indignity on Topsy was sure to meet with some inconvenient accident shortly after;--either a pair of ear-rings or some cherished trinket would be missing, or an article of dress would be suddenly found utterly ruined, or the person would stumble accidently into a pail of hot water, or a libation of dirty slop would unaccountably deluge them from above when in full gala dress;-and on all these occasions, when investigation was made, there was nobody found to stand sponsor for the indignity.
Only problem was I accidently turned into Daldowie Crematorium closely followed by a funeral procession.
Mudeer Khan'sfamily said he was hit by a bullet accidently, therefore, they don't consider anyone to be involved in his death and forgive the killer.
In other incident, a man was killed, while his friend got injured, when the vehicle they were travelling accidently fallen into deep ditch in Rahi-Nigor area.
However, the pistol went off accidently, due to which, a bullet hit the boy who died on the spot.
Rawalpindi -- A 10-year-old boy was killed as his uncle reportedly fired a 12-bore gun accidently at Dhoke Awan, the precinct of Police Station Jatli, official sources said here on Saturday.