(1):

(a.) Situated behind; hinder; - opposed to anterior.

(2):

(a.) Later in time; hence, later in the order of proceeding or moving; coming after; - opposed to prior.

(3):

(a.) At or toward the caudal extremity; caudal; - in human anatomy often used for dorsal.

(4):

(a.) On the side next the axis of inflorescence; - said of an axillary flower.