accidental
日本語WordNet
a musical notation that makes a note sharp or flat or natural although that is not part of the key signature
happening by chance or unexpectedly or unintentionally ; "with an inadvertent gesture she swept the vase off the table"; "accidental poisoning"; "an accidental shooting"
JMdict
AIによる解説
An adjective meaning 'happening by chance' or 'not planned'. As a noun in music, it refers to sharps, flats, or naturals that are not in the key signature (temporary alterations).
ライセンス: KeyLang Original
Essential properties belong to objects necessarily, persisting across all worlds containing them, while accidental properties vary contingently.
本質的性質は対象に必然的に属し、それらを含むすべての世界にわたって存続するが、偶有的性質は偶然的に変化する。
The discovery of penicillin was accidental.
ペニシリンの発見は偶然でした。
Pronunciation data from ipa-dict (MIT License) based on cmudict-ipa by @lingz