ah, says here that it means "great vehicle" (same diff, eh?):

Main Entry: Ma·ha·ya·na
Pronunciation: "mä-h&-'yä-n&
Function: noun
Etymology: Sanskrit mahAyAna, literally, great vehicle
Date: 1855
: a liberal and theistic branch of Buddhism comprising sects chiefly in China and Japan, recognizing a large body of scripture in addition to the Pali canon, and teaching social concern and universal salvation -- compare THERAVADA

Im probably getting way off topic here so you can PM me if you want, but Im curious now.. do you know why its called that? Ive been interested in Buddhism for quite a while now, pretty much since I became vegan.. but I dont know much about it. Ive been agnostic/atheist for a while, but it seems the more I learn about Buddhism the more sense it makes to me. I was just discussing this with RubyMutt the other day, in fact! lol