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

公卿[kugyou] Imperial Court
枢機卿[suukikyou] Cardinal (Catholic)
卿相[keishou] court nobles and state ministers
卿雲[keiun] auspicious cloud

六卿[rikukei] six ministers (of the six Zhou-dynasty Chinese ministries)
九卿[kyuukei] nine ministers (of the ancient Chinese government)
ご三卿[gosankyou] three secondary Tokugawa branch families (Tayasu, Shimizu, and Hitotsubashi)
三卿[sankyou] three secondary Tokugawa branch families (Tayasu, Shimizu, and Hitotsubashi)