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

愚昧[gumai] stupid
三昧[sanmai] samadhi (state of intense concentration achieved through meditation)
無知蒙昧[muchimoumai] unenlightened
あい昧[aimai] vague
曖昧さ[aimaisa] ambiguity

曖昧模糊[aimaimoko] obscure
曚昧[moumai] ignorance
読書三昧[dokushozanmai] being absorbed in reading
刃物三昧[hamonozanmai] (engaging in a) knife fight
贅沢三昧[zeitakuzanmai] indulging in every possible luxury