proper name · Sixth emperor of the Qing dynasty (1711–1799), personal name 弘历 Hóng​lì and princely title 宝亲王 Bǎo​qīn​wáng, who reigned from 1735 to 1799.

乾隆皇帝是中国历史上实际掌权时间最长的皇帝。

noun · The era name used during the reign of the Qianlong Emperor (1735–1799).

这件青花瓷器是乾隆年间的产物。