I'm reading through a Latin edition of the Republic. Book III starts off as follows:
Haec igitur sunt, ut mihi videtur, quae de Diis audienda aut non audienda sint prima a pueritia his, qui Deos et parentes honoraturi sunt communemque amicitiam non parvi facturi.
I was drawn to what seems to be a conjunction, communemque, and searched through dictionaries, but never found a result. I found some sentences online that use it, but it just seems to be translated as "and," obscuring any contextual nuance.
What does this term mean, and how is it used?