The word definiésemos is the imperfect subjunctive form of definir in the first person plural.
See the full definir conjugation
Creo que si definiésemos las tres principales direcciones del camino que estamos siguiendo, eso aclararía las cosas a todos.
I believe that if we were to define the three main directions in the road we are following, then that would clarify matters for everybody.
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