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

悪条件[akujouken] unfavorable conditions
暗殺事件[ansatsujiken] assassination
案件[anken] matter in question
一件[ikken] matter

怪事件[kaijiken] mystery case
基本条件[kihonjouken] basic conditions
刑事々件[keijijiken] criminal case
件数[kensuu] number of events (e.g. accidents, crimes, meetings, housing starts, hits on a web page)