you (honorific, familiar, male)
Honorific second-person pronoun used mainly by men in letters to address a male friend or superior. Familiar yet respectful; not used in everyday speech.
Dear Sir, I hope this letter finds you in ever greater prosperity.
Mr.; Mister (honorific suffix in letters)
Honorific suffix attached to the name of a male friend or superior in letters, similar to 'Mr.' but more intimate and respectful. Used by men.
Original meaning; now archaic or literary. In modern Japanese, 兄 is normally read あに for 'older brother'.
See also: 兄 (あに)
Dear Mr. Yamada, thank you for the other day.
In classical language, けい meant older brother, but today あに is common.
brother-in-law (spouse's older brother or older sister's husband) · older stepbrother
eldest brother
older male cousin
guardians; parents · father and older brother
dear friends; you all; those men
biological older brother; real older brother
one's deceased elder brother
you (honorific, familiar); dear friend
your elder brother
the younger of two elder brothers
eldest brother; eldest son
defer to as an older brother; treat with brotherly respect
older brother and older sister
brothers; older and younger brothers
older brother (honorific) · you (honorific, in letters)
my learned friend
The reading けい is the on'yomi (Sino-Japanese reading) of 兄. The honorific pronoun and suffix uses developed from the original meaning 'older brother' as a respectful term of address in written correspondence.