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

愛顧[aiko] patronage
一顧[ikko] (take no) notice of
恩顧[onko] favour
家庭を顧みない[kateiwokaeriminai] thinking little of one's family
回顧[kaiko] recollection

回顧録[kaikoroku] memoirs
軍事顧問[gunjikomon] military adviser
顧る[kaerimiru] to look back (e.g. over shoulder or at the past)
顧問[komon] adviser
顧慮[koryo] concern