(1):

(n.) A pool or lake.

(2):

(n.) A boundary.

(3):

(v. t.) To divide, limit, or bound.

(4):

(n.) A mare.

(5):

(Superl.) Unmixed; pure; entire; absolute; unqualified.

(6):

(Superl.) Only this, and nothing else; such, and no more; simple; bare; as, a mere boy; a mere form.