from The American Heritage® Dictionary of the English Language, 4th Edition
- pro. Informal The other.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- pro. Other.
From Middle English the tother, alteration of thet other, that other : thet, the (from Old English thæt; see that) + other, other; see other.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English, from the incorrect division of thet other ("the/that other"). Compare Scots tither; English tone. More at that, other. (Wiktionary)