Meaning of ACCIDENTAL in English

ACCIDENTAL

adj. & n.

--adj.

1. happening by chance, unintentionally, or unexpectedly.

2 not essential to a conception; subsidiary.

--n.

1. Mus. a sign indicating a momentary departure from the key signature by raising or lowering a note.

2 something not essential to a conception.

Derivatives:

accidentally adv.

Etymology: ME f. LL accidentalis (as ACCIDENT)

Oxford English vocab.      Оксфордский английский словарь.