confrere

The story

1. French · derived fromconfrère
2. Latin · derived fromconfrāter
3. Old French · derived fromconfrere
4. English todayconfrere

From Old French confrere, from Latin confrāter. The word which was originally only used for the second sense became obsolete in the 17th century and reappeared in the mid 18th century as a re-borrowing of Modern French confrère whence the first sense is from.