What does the word etiquette mean?

Usage examples for etiquette

  1. However, the reader will no doubt be obliged to me by my simply saying that a French surgeon in Prince Sulkowski's household took charge of the case in defiance of professional etiquette, and cured me perfectly, so I have my hand and my arm to this day. – The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons by Jacques Casanova de Seingalt
  2. But the etiquette of the Foreign Legion forbade. – The Truants by A. E. W. (Alfred Edward Woodley) Mason
  3. A sergeant of the South Loamshires whispered hoarsely to the Sapper as he reached the end of the sap- it is etiquette to whisper in a sap. – No Man's Land by H. C. McNeile