Accidental means happening by chance and not on purpose. An accidental death, accidental damage, accidentally deleted.
In law the difference between accidental and deliberate decides everything, and in insurance accidental damage is a separate cover that most basic policies leave out. In music an accidental is a sharp or flat not in the key signature.
1adjectiveaccidentalHappening by chance and not on purpose.
“The police said the fire was accidental, caused by a faulty heater.”
accidental is a quality of chance.
Latin accidentalis comes from accidere, to happen — ad plus cadere, to fall. An accident is what falls out.
Latin
accidēntālis
Middle French
accidentel
Anglo-Norman
accidentel
Middle English
accidental
English, today
accidental
From Middle English accidental, from Anglo-Norman accidentel, Middle French accidentel, accidental, and their source, Latin accidēntālis; corresponding to accident + -al.
Etymology from Wiktionary, CC BY-SA