μοναὶ  [2 verses](noun pl fem nom) "Mansions" is from mone, which means (as an adjective) "alone", "solitary", "made in one piece" (as an adverb) "on one condition", "only", "all but", (as a verb) "to be alone", "to live in solitary", "to individualize" (as a noun) "abiding", "tarrying", "permanence", "stopping place", "quarters", "billets."  --  The Greek word translated as "mansions" is only translated as mansions, rooms, or apartments here in John. The closest other Greek references to this idea of rooms is from the military use as billets or quarters, that is, a longer-term stopping place where soldiers stay separately. This is opposed to staying in a military camp, where everyone stays together.