עִישּׂוּר, (עֶשֶׂר) one tenth; (= מַעֲשֵׂר) tithe, giving tithes. Keth. 68ᵃ ראשונה נוטלת ע׳ נכסים וכ׳ the first daughter gets one-tenth of the estate, the second one-tenth of what is left &c. Bicc. II, 6 בשעת לקיטתו עִשּׂוּרוֹ the giving of tithes is regulated by the time it (the Ethrog) is plucked, expl. Y. ib. 65ᵃ bot. בשעת לקיטתו עישורו למעשרות ולשביעית this regulation refers to tithes as well as to the Sabbatical year (the time of plucking decides to which year the fruit belongs). Maas. Sh. V, 9; a. fr.—Trnsf. dedication, sanctification. Deut. R. s. 3 (ref. to Deut. VII, 13) מה פרי אדמתך צריכים ע׳ … צריכים ע׳ וכ׳ as the fruit of thy soil requires sanctification by tithes, so the fruit of thy womb requires sanctification, which is circumcision.—Pl. עִישּׂוּרִים, עִישּׂוּרִין, עִשּׂ׳. R. Hash. 14ᵃ נהג בו שני ע׳ he subjected it to two tithes (that of the second and that of the third year). Tosef. Dem. VIII, 18 תשעים ושלשה חסר שני ע׳ ninety-three parts less two-tenths. Ib. 15 שתי תאנים ושני ע׳ ועִישּׂוּרוֹ של עישור two figs (as Trumah), and two tithes (first and second), and tithe of the tithes (= מעשר מן המעשר); Y. ib. I, end, 22ᵇ ועישורין של עישור (corr. acc.).