Strong’s Greek
G4599 — sthenoo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σθενόω
sthenoo — pronounced sthen-o'-o
from sthenos (bodily vigor; probably akin to the base of 2476); to strengthen, i.e. (figuratively) confirm (in spiritual knowledge and power):--strengthen. see GREEK for 2476
1 occurrence in the KJV.
1 Peter 5:10
But the God of all grace, who hath called us unto his eternal glory by Christ Jesus, after that ye have suffered a while, make you perfect, stablish, strengthen, settle you.