御三時[osanji] three-o'clock snack
三鞭酒[shanpen] champagne
球面三角法[kyuumensankakuhou] spherical trigonometry
胸三寸[munesanzun] heart
元三[ganzan] New Year's period (January 1st to 3rd)

五十三次[gojuusantsugi] the 53 Toukaidou stages
向こう三軒[mukousangen] one's next three neighbors
降三世明王[gouzanzemyouou] Trailokyavijaya Vidya-raja
再三[saisan] again and again
再三再四[saisansaishi] repeatedly

較優位論[kakuyuuiron] theory of comparative advantage
見優り[mimasari] compare favourably
公益優先[kouekiyuusen] public interest first
航空優勢[koukuuyuusei] air superiority
射撃の優先順位[shagekinoyuusenjuni] priority of fires

女優[joyuu] actress
乗降車優先[joukoushayuusen] priority to pedestrians
声優[seiyuu] voice actor or actress (radio, animation, etc.)
全優[zenyuu] straight A's
男優[danyuu] actor