köken: From Latin plēnus, from Proto-Italic *plēnos, from Proto-Indo-European *pl̥h₁nós (“full”). Compare Catalan ple, French plein, Portuguese cheio, Romanian plin, Sardinian prenu, Sicilian chinu, Spanish lleno.
aile: fare il pieno, in pieno, pienamente, pienezza, pienone, pienotto, soprappieno, strapieno
köken: Formed as if it was the perfect passive participle of a verb *differciō, from dis- + farciō (“to cram, stuff”). Compare cōnfertus from cōnferciō etc.