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

会則[kaisoku] society or club regulations
回線制御規則[kaisenseigyokisoku] line discipline
学則[gakusoku] school regulations
規則[kisoku] rules
規則を敗る[kisokuwoyaburu] to break the rules

規則正い[kisokutadashii] regular
規則的[kisokuteki] systematic
教則[kyousoku] rules of teaching
禁則[kinsoku] prohibition
原則[gensoku] principle