Rosh Hashanah
noun
Rosh Ha·sha·nah ˌräsh-(h)ə-ˈshä-nə 
ˌrōsh-,
-ˈshō-
: the Jewish New Year observed on the first day and by Orthodox and Conservative Jews also on the second day of Tishri
Word History
Etymology
Late Hebrew rōsh hashshānāh, literally, beginning of the year
First Known Use
1594, in the meaning defined above
Kids Definition
Rosh Hashanah
noun
Rosh Ha·sha·nah ˌrōsh-hə-ˈshō-nə
: the Jewish New Year observed as a religious holiday in September or October