köken: Cognate with Kazakh жігерлі (jıgerlı, “active, vigorous”), Kyrgyz жигердүү (jigerdüü, “brave, valiant; active”). Ultimately derived from Persian جگر (jegar) in the sense of "spirit, courage".
köken: Uncertain. Traditionally connected with dialectal ahku (“eagerness, zeal”), but this word is likewise of unknown origin. According to Häkkinen (2004), which follows Nikkilä (1998), perhaps a borrowing from dialectal Swedish ager (“hard-working”), but this sense for the word, supposedly found only in dialects within Finland, does not seem to have a particularly wide distribution nor even be the…
köken: Probably from indu (“in, within”), archaic variation of in, + struō (“build”). Sometimes connected to Old High German ustrī (“industry”), Old English and-ūstrian (“to hate, detest”).
Etymology tree Esperanto labori Proto-Indo-European *h₃emh₃- Proto-Indo-European *-ti Proto-Indo-European *h₃émh₃ti Proto-Italic *amō Latin amō Latin amāre Old French amer Middle French aymer French aimer French aimeder. Esperanto -ema Esperanto laborema From labori (“to work”) + -ema (“inclined to”).