noun, na-adjective, noun which may take the genitive case particle 'no'
Poetic or literary term for an unchanging, everlasting state. Often used in set phrases like 永久の別れ or in lyrical expressions.
二人の愛は永遠だと信じていた。
I believed our love was eternal.
永遠の平和を願ってやまない。
I never stop wishing for everlasting peace.
Derived from classical Japanese とわ (永久), a compound of と (eternal) and は (thing). The kanji 永久 and 永遠 are later Chinese borrowings applied to this native word.