Pronunciation: ( Seph. Heb.shä-vOO-ôt'; Ashk. Heb.shu-vOO'ōs, -us),[key] —n.Judaism. a festival, celebrated on the sixth and seventh days of Sivan by Orthodox and Conservative Jews outside Israel but only on the sixth day by Reform Jews and Jews in Israel, that commemorates God's giving of the Ten Commandments to Moses. Also,Sha•vu•ot',Sha•vu'os,Shabuoth,Shabuot.Also called Feast of Weeks, Pentecost.