Where does “achaison” come from?

achaison (Old French) comes from Latin occasio, from Latin occasus, from Latin occidō, from Latin ob-, from Latin obolus, from Ancient Greek ὀβολός, from Ancient Greek ὀβελός, from Ancient Greek βέλος — to throw, reach, pierce; to hit by throwing.

Ancestry of “achaison”, step by step

StepLanguageWordMeaning
1Latinoccasiooccasion, opportunity; kairos, the right time,...
2Latinoccasussetting; west; western
3Latinoccidōto fall down
4Latinob-towards; against
5Latinobolusobolus (Greek coin)
6Ancient Greekὀβολόςobol, obolus, used at Athens as both a weight and...
7Ancient Greekὀβελόςa spit, rod; a horizontal line
8Ancient Greekβέλοςmissile, arrow, dart; weapon; something quickly...
9Proto-Indo-EuropeangʷélHos
10Proto-Indo-EuropeangʷelH-to throw, reach, pierce; to hit by throwing
Every word from Proto-Indo-European gʷelH-