[rohsh hah-shaw-nuh, -shah-, huh-, rawsh; Ashk. Heb. rohsh hah-shaw-nuh; Seph. Heb. rawsh hah-shah-nah] 
| a Jewish high holy day that marks the beginning of the Jewish New Year, celebrated on the first and second days of Tishri by Orthodox and Conservative Jews and only on the first day by Reform Jews. |
The festival of the New Year in Judaism, falling in September or October. Rosh Hashanah, Yom Kippur, and the eight days in between are special days of penitence.