Meaning of amicus usque ad aras*

a•mi•cus us•que ad a•ras

Pronunciation: (ä-mē'koos oos'kwe äd ä'räs Eng. &schwa-mī'k&schwas us'kwē ad ā'ras, &schwa-mē'-), [key]
— Latin. Latin.
  1. a friend to the last degree.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.