Beyond the cosmic drama of Lurianic theology, the word tikkun names a number of specific, concrete devotional practices in Jewish life, and setting them out shows how a technical kabbalistic term settled into ordinary religious calendar and custom.
Tikkun Chatzot, the midnight rectification, is a set of prayers recited by kabbalistically inclined and Hasidic Jews in the middle of the night, mourning the destruction of the Temple and the exile of the Shekhinah and expressing longing for redemption; it is associated with circles influenced by Isaac Luria's own Safed community and later spread through Hasidism, understood as a personal contribution, through grief and prayer, to the larger cosmic repair the Lurianic system describes.
Tikkun Leil Shavuot, the rectification of the night of Shavuot, is the custom of staying awake all night studying a fixed anthology of biblical, rabbinic and kabbalistic texts on the eve of the festival that commemorates the giving of the Torah at Sinai. The custom is traced to the sixteenth-century kabbalists of Safed, including Moses Cordovero and Isaac Luria's circle, and rests on a specific rationale, that Israel is traditionally said to have overslept on the original morning of the revelation at Sinai, so that the vigil corrects, or repairs, that ancient lapse. A comparable practice, Tikkun Leil Hoshana Rabbah, keeps vigil the night before the last day of Sukkot.
Tikkun, without qualification, also names a printed volume for ritual use, most commonly a Tikkun Korim, laying out the Torah scroll's text for a reader to rehearse cantillation before a public reading, since the scroll itself is unpointed, a wholly practical sense sharing only its etymology with the theological uses described elsewhere.