敬启者

Dear Sirs / To Whom It May Concern

(after a verb or adjective) one who (is) ... / (after a noun) person involved in ... / -er / -ist / (used after a number or 後|后[hou4] or 前[qian2] to refer to sth mentioned previously) / (used after a term, to mark a pause before defining the term) / (old) (used at the end of a command) / (old) this

to respect / to venerate / to salute / to offer

(bound form) respectful; to respect / to offer politely

variant of 啟|启[qi3]

variant of 啟|启[qi3]

Qi son of Yu the Great 禹[Yu3], reported founder of the Xia Dynasty 夏朝[Xia4 Chao2] (c. 2070-c. 1600 BC)

to open / to start / to initiate / to enlighten or awaken / to state / to inform

respectful closing to a letter