opening; door; gate; doorway; gateway; valve; switch; way to do something; knack; family; house; (religious) sect; school (of thought); class; category; phylum or division (taxonomy)
In ancient times, when a monarch went on an expedition (ex. for hunting), the place where he stopped would be made into a camp by surrounding the location with a baricade of horse-drawn vehicles. Two of the vehicles would be upended, and their shafts would be made to meet, so as to form a makeshift gateway of sorts.