n.
Function: adjective
Date: 15th century
1 a : being at or in the back < back door> b : distant from a central or main area < back roads> c : articulated at or toward the back of the oral passage < back vowels>
2 : having returned or been returned
3 : being in arrears : OVERDUE
4 : moving or operating backward : REVERSE
5 : not current < back issues of a magazine>
6 : constituting the final 9 holes of an 18-hole golf course