ADV
of one another

The following video provides you with the correct English pronunciation of the word "alterius", to help you become a better English speaker.

alterius
adv. of one another; 

alter, altera, alterum
adj. |second/further/next/other/latter/some person/thing (PRONominal ADJ); either; 

alter, altera, alterum
adj. one (of two); second/another; former/latter; [unus et ~=> one or two/other];