Strong’s Greek
G1441 — hebdomekontakis
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἑβδομηκοντάκις
hebdomekontakis — pronounced heb-dom-ay-kon-tak-is
multiple adverb from 1440; seventy times:--seventy times. see GREEK for 1440
1 occurrence in the KJV.
Matthew 18:22
Jesus saith unto him, I say not unto thee, Until seven times: but, Until seventy times seven.