Chabad Knowledge Base
(lit. a biblical measure of approx. 43 oz.) the formal counting of the 49 days from the second day of Passover -- when the Omer offering was brought in the Holy Temple -- to the eve of Shavuot, signifying our preparation for the receiving of the Torah on the holiday of Shavuot.
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Entry for 'Omer'. Chabad Knowledge Base. https://www.studylight.org/dictionaries/eng/ckb/o/omer.html. 2012.