accidental

US /ˌæk.səˈden.t̬əl/
UK /ˌæk.səˈden.t̬əl/
"accidental" picture
1.

accidental, fortuito

happening by chance or unexpectedly

:
Their meeting was purely accidental.
Su encuentro fue puramente accidental.
He made an accidental discovery.
Hizo un descubrimiento accidental.
1.

accidente

a musical note that is not part of the key signature but is introduced by a sharp, flat, or natural sign

:
The composer used an accidental to temporarily alter the pitch of the note.
El compositor usó un accidente para alterar temporalmente el tono de la nota.
You need to play that F sharp, it's an accidental.
Tienes que tocar ese Fa sostenido, es un accidente.