(1):

(n.) Something that stands alone or by itself.

(2):

(n.) Something that shoots, or spreads out, beyond the rest, or too far; an exuberant growth.

(3):

(n.) One who straggles, or departs from the direct or proper course, or from the company to which he belongs; one who falls behind the rest; one who rambles without any settled direction.

(4):

(n.) A roving vagabond.