Dictionary.com
definitions

Shabuoth

or Sha·bu·ot

[Sephardic Hebrew shah-voo-awt; Ashkenazic Hebrew shuh-voo-ohs, -uh s]
noun
  1. Judaism. Shavuoth.

Shavuoth

or Sha·vu·ot, Sha·vu·os, Sha·bu·oth, Sha·bu·ot

[Sephardic Hebrew shah-voo-awt; Ashkenazic Hebrew shuh-voo-ohs, -uh s]
noun Judaism.
  1. 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.

Origin of Shavuoth

First recorded in 1890–95, Shavuoth is from the Hebrew word Shābhūʿōth literally, weeks
Also called Feast of Weeks, Pentecost.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for shabuoth

Shabuoth

noun
  1. a variant spelling of Shavuot
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012