What does anterior mean?
The definition of anterior
An*te”ri*or, a.
Etym: [L. anterior, comp. of ante before.]

1 Before in time; antecedent. Antigonus, who was anterior to Polybius. Sir G. C. Lewis.
2 Before, or toward the front, in place; as, the anterior part of the mouth; — opposed to posterior.

Note: In comparative anatomy, anterior often signifies at or toward the head, cephalic; and in human anatomy it is often used for ventral.
— Antecedent; previous; precedent; preceding; former; foregoing.