元号は英語で
era name

英語の定義

元号
1. n. an era name, imperial era name
2. n. Usage: Gengō are applied to periods from a few years to several decades. Such era names were used in former times in China and many other East Asian nations; now used only in Taiwan and Japan.

era name

era name

era name
1. n. The regnal year, reign period, or regnal title used when traditionally numbering years in an emperor's reign and naming certain Chinese rulers.