Meaning of INCIDENCE in English

INCIDENCE

/ ˈɪnsɪdəns; NAmE / noun

1.

[ C , usually sing. ] incidence of sth ( formal ) the extent to which sth happens or has an effect :

an area with a high incidence of crime

2.

[ U ] ( physics ) the way in which light meets a surface :

the angle of incidence

••

WORD ORIGIN

late Middle English (denoting a casual or subordinate event): from Old French , or from medieval Latin incidentia , from Latin incidere fall upon, happen to, from in- upon + cadere to fall. Sense 1 dates from the early 19th cent.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.