Taanith Esther

or Ta·a·nit Es·ther, Ta·a·nis Es·ther

[ tah-nit es-ter, -nis; Sephardic Hebrew tah-ah-neet es-ter; Ashkenazic Hebrew tah-ah-nis es-tuh r ]
/ ˈtɑˌnɪt ˈɛs tər, -nɪs; Sephardic Hebrew ˌtɑ ɑˈnit ɛsˈtɛr; Ashkenazic Hebrew ˈtɑ ɑ nɪs ˈɛs tər /

noun

a Jewish fast day observed on the 13th day of the month of Adar in memory of Esther's fast of three days before petitioning her husband, King Ahasuerus of Persia, to spare the Jews from destruction by Haman.
Also called Fast of Esther.

Origin of Taanith Esther

From the Hebrew word taʿanīth estēr fast of Esther