entonces
/enˈtonθes/ · A1 · adv
then, next, thereupon, at that time, at that point
en + tonces: from Latin in + tunc (then) = at that then
Latin tunc meant then; Old Spanish estonce/entonce added a prefix and a final -s. English then and Latin tunc share the same t-n skeleton: en-TON-ces holds a hidden THEN. Used for both at that time and so/therefore.