Where does “adonc” come from?

adonc (Old French) comes from Latin tunc, from Latin tum, from Proto-Indo-European tóm, from Proto-Indo-European só — this; that.

Ancestry of “adonc”, step by step

adonc traces back through two separate lines of ancestry.

via Latin tunc

StepLanguageWordMeaning
1Latintuncthen, "in its senses as"; from then on: from that...
2Latintumthen, thereupon; at the time, at that time, then;...
3Proto-Indo-Europeantóm—
4Proto-Indo-Europeansóthis; that

via Latin ad

StepLanguageWordMeaning
1Latinadtoward, to; up to; near, by, close by, at, to
2Proto-Italicadtoward, to, on, up to, for
3Proto-Indo-Europeanh₂édto, at
Every word from Proto-Indo-European só →Every word from Proto-Indo-European tóm →Every word from Latin tum →