Dictionary of Biblical Words:
A very common expression, “Called saints,” or lit. “Saints by calling.” It is connected with predestination (Rom. 8:30) and the sovereignty of God; the occasion being when we believed in Christ, and thus truly heard the voice of God. Besides this general calling, God “calls” some specially for particular lines of service. In every case it is purely a question of God’s sovereignty and good pleasure.
Strong’s Dictionary of Greek Words:
Meaning:
from the same as 2821; invited, i.e. appointed, or (specially), a saint