mac ‧ ro ‧ cos ‧ m /ˈmækrəʊˌkɒz ə m $ -kroʊˌkɑː-/ BrE AmE noun [countable]
[ Date: 1600-1700 ; Language: Medieval Latin ; Origin: macrocosmos , from Latin macro- ( ⇨ ↑ macro- ) + Greek kosmos ( , ↑ cosmos ) ]
a large complicated system such as the whole universe or a society, considered as a single unit OPP microcosm