Koine Greek vs. Classical/Attic Greek distinction and its relevance to authenteo

Classical/Attic Greek (5th-4th century BC) had a different vocabulary and usage than Koine Greek (3rd century BC through early centuries AD), which was the common language of the NT era. In Classical Greek, words related to authenteo (like authentes) often carried meanings of 'murderer' or 'one who acts with one's own hand' — clearly negative. However, by the Koine period, the word family had shifted toward 'authority/master.' Mike argues that egalitarians often cite Classical-era meanings to argue the word is pejorative, but this is anachronistic — like citing 17th-century English word meanings to determine modern usage. The relevant evidence is from the Koine period, contemporary with the NT.