subvention (n.)

early 15c., from Old French subvencion "support, assistance, taxation" (14c.), from Late Latin subventionem (nominative subventio) "assistance," noun of action from past participle stem of Latin subvenire "come to one's aid, assist, reinforce," from sub "up to" (see sub-) + venire "to come," from a suffixed form of PIE root *gwa- "to go, come."