Imperator

Proper noun

formal

(formal, usually italicized) The reigning emperor; male equivalent of Imperatrix

Japanese Meaning

現皇帝（在位している男性の皇帝）

When the Imperator entered the hall, the senators bowed in reverence.

現職の皇帝が広間に入ると、元老院議員たちは敬意を表して頭を下げた。

Sense（1）

(formal, usually italicized) The reigning emperor; male equivalent of Imperatrix