open letter

1. 1.

   a letter of protest; addressed to one person but intended for the general public

   Broaderletter

Questions about open letter

What does open letter mean?

open letter means "a letter of protest; addressed to one person but intended for the general public".

Is open letter a common word?

open letter is banded "Rare" — specialist or archaic — most readers will not have met it. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.