R. Elazar b. Azaryah says: "Krithuth" — something that severs (completely) between himself and her. R. Yossi said: I subscribe to the words of R. Elazar b. Azaryah.
R. Akiva says: On what basis was the Torah stringent vis-à-vis (forbidding) a divorcée to a Cohein or a married woman to all men? (It must be that the ban against) a married woman is more stringent than that of a divorcée (to a Cohein). Now if a divorcée, of lesser stringency, is forbidden (to one who was once permitted to her), then a married woman, of greater stringency, how much more so should she be forbidden (to one who was once permitted to her [if her divorce is only conditional])? — so that this is not krithuth.