1reign 
/ˈreɪn/ noun
plural reigns /ˈreɪn/ noun [count] 1 : the period of time during which a king, queen, emperor, etc., is ruler of a country
▪ She was a popular ruler throughout her reign. ▪ the reign of Queen Elizabeth 2 : the period of time during which someone is in charge of a group or organization
▪ his reign as department chairperson ▪ her reign as team president 3 : the period of time during which someone or something is the best or the most important, powerful, etc.
▪ his reign as heavyweight boxing champion ▪ the reign of digital technology
▪ She was a popular ruler throughout her reign. ▪ the reign of Queen Elizabeth
▪ his reign as department chairperson ▪ her reign as team president
▪ his reign as heavyweight boxing champion ▪ the reign of digital technology
