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Vine's Expository Dictionary of NT Words

1: ἐνδυναμόω (Strong'S #1743 — Verb — endunamoo — en-doo-nam-o'-o )

"to render strong" (en, "in," dunamis, "power"), is translated "enabled" in  1 Timothy 1:12 , more lit., "instrengthened," "inwardly strengthened," suggesting strength in soul and purpose (cp.  Philippians 4:13 ). See Strength , Strong. (In the Sept.,   Judges 6:34;  1 Chronicles 12:18;  Psalm 52:7 .)

Webster's Dictionary

(1): ( v. t.) To make able (to do, or to be, something); to confer sufficient power upon; to furnish with means, opportunities, and the like; to render competent for; to empower; to endow.

(2): ( v. t.) To give strength or ability to; to make firm and strong.

International Standard Bible Encyclopedia

en -ā´b 'l : Only in  1 Timothy 1:12 (the King James Version and the Revised Version (British and American)) in the sense of "strengthen" (Greek endunamóō , "endue with strength").