啓 - disclose, open, say

Dear (so and so); Dear Sir; Dear Madam; To Whom It May Concern

enlightenment; development; edification; public awareness; illumination; education; inspiration

enlightenment; illumination

(divine) revelation

illuminism; enlightenment

Dear Sir or Madam, in reply to your letter ...

Dear Sir or Madam

dispensing with the preliminaries ...

postscript; P.S.; PS

(divine) revelation; divine oracle

information campaign; awareness program

edification; enlightenment; guide