אָכֵן

אָכֵן (perhaps from אַח; compare Aramaic דֵּח & דִּכֵּן) adverb with strong asseverative force:
\ \ a. surely, truly, especially at beginning of a speech (stronger & more decided than אַח) 1 Mos 28,16; 2 Mos 2,14; 1 Sam 15,32; Es 40,7; Es 45,15; Jer 3,23 (twice in verse); Jer 4,10; Jer 8,8. In 1 Kong 11,2 אָבֵן stands unusually; and פֶּןֿ (compare ᵐ5 ᵑ6 ᵑ7) should probably be read (so Klo).
\ \ b. emphasizing a contrast, but indeed, but in fact, especially after אָמַרְתִּי I said or thought, expressing the reality, in opposed to what had been wrongly imagined, Es 49,4b (opposed to v^a) Es 53,4 (opposed to vEs 53,3 end) Jer 3,20 (opposed to the expectation vJer 3,19 b) Sef 3,7b Sl 31,23b (opposed to vSl 31,23a) Sl 66,19; Sl 82,7 (opposed to vSl 82,6) Job 32,8 (opposed to vJob 32,7).