(1):

(n.) The top, or crown, of the head.

(2):

(n.) The point in any figure opposite to, and farthest from, the base; the terminating point of some particular line or lines in a figure or a curve; the top, or the point opposite the base.

(3):

(n.) The zenith, or the point of the heavens directly overhead.

(4):

(n.) A turning point; the principal or highest point; top; summit; crown; apex.