אַךְ (ʾak) is
a Hebrew adverb
meaning surely. It appears
161 times
in 25 books of the Hebrew Bible
(Strong's H389).
Same Hebrew root (TWOT 84)
Range of meaning (TWOT 84)surely; affirmation, only; also, in any wise, at least, but, certainly, even, howbeit, nevertheless, notwithstanding, save, of a surety, truly, verily, wherefore, yet
Full entry: Brown-Driver-Briggs and Strong's
אַךְadverb: surely
surely. 2. with a restrictive force, emphasizing what follows
Strong's H389אַךְ: a particle of affirmation, surely; hence (by limitation) only KJV:also, in any wise, at least, but, certainly, even, howbeit, nevertheless, notwithstanding, only, save, surely, of a surety, truly, verily, wherefore, yet (but).
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.