How do you spell Thither

Available Definitions:
1)  adv. - To that place; -- opposed to hither.
2)  adv. - To that point, end, or result; as, the argument tended thither.
3)  a. - Being on the farther side from the person speaking; farther; -- a correlative of hither; as, on the thither side of the water.
4)  a. - Applied to time: On the thither side of, older than; of more years than. See Hither , a.