noun-modifying (irregular)
Used before another noun or inside compounds to give the sense of 'imperial.' In ordinary explanatory Japanese, 帝国の, 皇帝の, or 皇室の may be clearer depending on context.
新婚旅行でインペリアルスイートに泊まった。
We stayed in an imperial suite on our honeymoon.
A native Sino-Japanese expression meaning 'of an empire' or 'imperial'; often clearer in normal prose than the katakana インペリアル.
Means 'of the emperor' specifically; インペリアル is broader and often used as a foreign-style label or compound element.
Means 'royal' rather than strictly 'imperial'; both are common in names and luxury branding, but they refer to different kinds of sovereignty.
Katakana form corresponding to the meaning 'imperial'; no language of origin or detailed borrowing history is specified.