One of the mysteries of the English language finally explained.
An additional prayer service recited on the Sabbath and festivals, immediately after the Torah reading which follows the morning prayers. Also: an additional Temple sacrifice formerly required to be made on the Sabbath and festival days (now historical).
Mid 17th century. From post-biblical Hebrew mūsāp (adjective) additional, (noun) addition, additional prayer from yāsap to add, increase.
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