1. An option or choice that is not known, recognized, or identified; an unfamiliar or unacknowledged possibility
We explored every known option, but there might be an unknown alternative we haven't considered yet.
Exploramos todas as opções conhecidas, mas pode haver uma alternativa desconhecida que ainda não consideramos.
2. A solution or path forward that exists but has not been discovered or made apparent
The team realized there was an unknown alternative to their current approach.
A equipe percebeu que havia uma alternativa desconhecida para sua abordagem atual.