How do you spell Further

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