(1):
(superl.) More remote; at a greater distance; more in advance; farther; as, the further end of the field. See Farther.
(2):
(adv.) To a greater distance; in addition; moreover. See Farther.
(3):
(adv.) To help forward; to promote; to advance; to forward; to help or assist.
(4):
(superl.) Beyond; additional; as, a further reason for this opinion; nothing further to suggest.