כֶּסֶא, (כָּסָה I) mark, distinction; marked, appointed time. Lev. R. s. 29; Pesik. Baḥod., p. 153ᵃ (ref. to Ps. LXXXI, 4) וכי כל החדשים אינן חדש אלא בכ׳ ‘on the New Moon’, are all other new moons no New Moons (festive days)?; but (therefore is added) bakkesé, on the distinguished (month), v. כָּסָה I. [Pirké d’R. El. ch. VII, end, a. Bets. 16ᵃ our w. is taken in the sense of cover.]