MANSION.The English word occurs in Scripture only in Joh_14:2, In my Fathers house are many man-sioos (RVm [Note: Revised Version margin.] Or, abiding places). Its retention is an archaism, for the modern connotation of a house of some dignity is quite lacking from the word as used by Tindale (1525), apparently from the Vulg. [Note: Vulgate.] mansiones, abiding places. The Gr. word (monç), like the Latin, means (1) the act of abiding, (2) a place of abode. In the NT it occurs also in Joh_14:23, where make our abode is Greek idiom for abide. Hence the thought in Joh_14:2 is simply that there is ample room for the disciples in the Fathers house. In the LXX [Note: Septuagint.] the Gr. word occurs only once, viz. 1Ma_7:38, give them no abiding place (RV [Note: Revised Version.] suffer them not to live any longer).
S. W. Green.
Hastings' Dictionary of the Bible
Edited by James Hastings, D.D. Published in 1909
man?shun (μονή, monḗ, ?abode?): In Joh_14:2, the word is used in the plural: ?In my Father's house are many mansions,? the Revised Version margin ?abiding places.? The ideas conveyed are those of abundance of room, and permanence of habitation, in the heavenly world.
International Standard Bible Encyclopedia
PRINTER 1915.
Joh_14:2 (b) Our blessed Lord used this word to describe the wonderful place He is preparing in glory for His own children. We do not know what it is like, nor just where in glory it will be located, but we do know that if the architect of the universe is making it, it will be gorgeous, glorious and marvelous.
Wilson's Dictionary of Bible Types
press 1957.