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

誠に[makotoni] indeed
誠意[seii] sincerity
誠実[seijitsu] sincere
誠心誠意[seishinseii] in all sincerity
丹誠[tansei] working earnestly

忠誠[chuusei] loyalty
不誠意[fuseii] insincerity
不誠実[fuseijitsu] insincerity
至誠[shisei] sincerity