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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).


a variant (now obsolete) of accidentally
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.
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.
The robbers opened fire at Shahbaz and one of the bullets accidently hit their own accomplice.
According to rescue sources, one Asad, aged 20, son of Johar, a private security guard, suffered serious bullet injuries and died on the spot, when his gun accidently went off while taking a selfie in Liaquat Market of Malir.
Summary: New Delhi [India], December 12 (ANI): A two-year-old child died after accidently falling into a bucket full of water on Tuesday in Delhi's Wazipur area on Tuesday.
According to police, a man named Major (retd) Khurshid Malik, the owner of 2000 Security Company, was cleaning the barrel of his 30 bore pistol in his office located at Shamilar Plaza on Mall Road when a bullet was fired accidently.
MULTAN -- Five students were injured when a bus hit wall of the school accidently here on Saturday.