Strong’s Greek
G2434 — hilasmos
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἱλασμός
hilasmos — pronounced hil-as-mos'
atonement, i.e. (concretely) an expiator:--propitiation.
2 occurrences in the KJV.
1 John 2:2
And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.
1 John 4:10
Herein is love, not that we loved God, but that he loved us, and sent his Son to be the propitiation for our sins.