Home › Words › T › tricenariantricenarian/ˌtraɪ.sɪˈnɛəɹi.ən/tricenarian means the highest rank and pay grade for prefectures in Ancient Rome.tricenarian is pronounced /ˌtraɪ.sɪˈnɛəɹi.ən/.EtymologyFrom Latin trīcēnārius, equivalent to tricenary + -an.nounThe highest rank and pay grade for prefectures in Ancient Rome.A person in their thirties, a person aged between 30 and 39 years (inclusive).Definitions & examples from Wiktionary (CC BY-SA 3.0).