Wiktionary
shiur
n. A lesson on a topic in the Torah.
Wikipedia
Shiur (Torah)
Shiur (, , pl. shiurim, שיעורים ) is a lesson on any Torah topic, such as Gemara, Mishnah, halakha, Tanakh, etc.
Usage examples of "shiur".
In books like Ezekiel, The Lesser and Greater Hekhalot, Merkabah Rabbah, Shiur Komah, and the Book of Enoch, they outlined this potpourri of Jewish, Persian, and Gnostic meditations so that only the most ardent, most impeccably prepared initiate could practice them.