"'Hodor,' Bran agreed, wondering what it meant." AGOT pg. 582.
Why keep the meaning of the word "Hodor" secret through five books unless GRRM intends to make the reveal a central point in the conclusion of ASOIAF? If the meaning of "Hodor" does have an impact on the conclusion what could it be?
Most everyone predicts that GRRM will bring the story around to include a massive battle between the Others and the Nights Watch. Many believe that GRRM will make Dany's dragons (or other dragons e.g. below Winterfell) a major feature of the battle with the Others. We know that Dany was able to teach her dragons a few words of old High Valyrian such as "Dracarys" or "dragonfire". ASOS pg 115.
However, Dany has stuggled to to find a way to control her dragons. To this point of the story there are two theories being proffered on how to control dragons: 1. the Valyrian horn found by Euron Greyjoy, and 2. Warging.
I think their is a third possibility, the magic word "Hodor". Hodor aka Walder is in the North beyond the wall with Bran and the COTF. Which places "Hodor" in the right place to make a contribution to the outocme with the battle against the Others when the meaning of the word "Hodor" is revealed. It's hinted at that Hodor is part giant therfore I beleibe it's more likely that the meaning of "Hodor" will have more to do with the language of the COTF rather than High Valyrian.
On the way to the Wall Tyrion Lannister is reading a very old and rare book borrowed from Winterfell about dragons, admitting to Jon Snow that he was fascinated with dragons as a child. AGOT pgs. 121-124.
Given the events of ADWD it's likely that Tyrion will acompany Dany back to Westeros, if Dany's return leads to the Wall then it is likely that Tyrion, who does not beleive that the Others exist, will be in a position to make a contribution to the battle with the Others. Keep in mind that Tyrion Lannister and Jon Snow parted as friends when Tyrion left the Wall (AGOT pg. 213) and I believe that GRRM will bring these friends back together.
If "Hodor" is a magic word for controlling dragons there are then 4 possible methods of learning the meaning of the word "Hodor" in keeping with the story so far; the meaning is revealed by: 1) the COTF; 2) Tyrion Lannister's study of dragons; 3) Bran or another character calling "Hodor" by name in the presence of the dragons; or 4) Walder the big "Hodor" himself tells us what it means.
Edited by Howling4Reed, 04 March 2012 - 04:48 PM.