Ichigo ichie (一期一会): one lifetime, one meeting. A tea ceremony phrase. Host and guest should treat each gathering as one that will happen only once in their lives, and act with complete sincerity.
It first appears in the record of the tea master Yamanoue Sōji as ichigo ni ichido no kai, a gathering once in a lifetime. Ii Naosuke later stressed it in his tea treatise Chanoyu ichie shū.