Concise Bible Dictionary:

The prophetic language in the Psalms is not that of the mass of Israel, but of the remnant, in whom the Spirit of Christ speaks; and it is in the Psalms that the remnant is first seen as distinguished from the ungodly nation. The idea of a remnant is found also in the address to the church in Thyatira, and to that remnant (“the rest”) it was said, “That which ye have already hold fast till I come” (Rev. 2:24-2524But unto you I say, and unto the rest in Thyatira, as many as have not this doctrine, and which have not known the depths of Satan, as they speak; I will put upon you none other burden. 25But that which ye have already hold fast till I come. (Revelation 2:24‑25)). They represent the faithful in the time of the supremacy of the apostate Popish system.
A remnant represents morally the original whole, and does not imply an inferior remaining portion. It is of God’s grace that any are enabled to be steadfast to the original truth and calling during a general apostasy from it.

Strong’s Dictionary of Hebrew Words:

from 5628; a redundancy
KJV Usage: