Entry 1 sense Webster, 1913 Greco-Roman /grĕkˌ-ōr-ōm'-ən/ · Gre·co-Ro·man · IPA /ˌɡɹɛkoʊˈɹoʊmən/ 01 a. Having characteristics that are partly Greek and partly Roman; as, Greco-Roman architecture. 1. Having characteristics that are partly Greek and partly Roman; as, Greco-Roman architecture.