Lewis & Short

2. sē (sēd).

      1. 1. Prep., v. sine init.
      2. 2. Prep. insepar.
        1. a. For sine, without; e. g. securus (= sine curā).
        2. b. Aside, by itself; as sepono, to lay aside.
      3. 3. sē = semi, half; as selibra, semodius.
      4. 4. sē = sex; as semestris.