Latin word oppono comes from Latin ob, Latin pono (I ordain. I place, put, lay. I set up, pitch (camp).)

Detailed word origin of oppono

Dictionary entry	Language	Definition
ob	Latin (lat)	Against; facing. In the direction of, to, towards. On account of, according to, because of, due to, for (the purpose of).
pono	Latin (lat)	I ordain. I place, put, lay. I set up, pitch (camp).
opponere	Latin (lat)

Words with the same origin as oppono