Definitions for "Rosh"
Rabbenu Asher ben Yechiel. A talmudic codifier whose responsa are a primary source for history of the Spanish Jews of the fourteenth century. His decisions (Piskei HaRosh), a compendium of Jewish law, are still standard.
odesh first day of the new Jewish month.
Hashana The Jewish New Year; a two day holiday occuring in September.
Head (Director)
Head of something (e.g. Rosh of an age group)