noun, noun or participle which takes 'suru'
fulfillment of a long-cherished wish; realization of one's earnest desire
A somewhat formal, literary expression for a deeply held wish finally coming true. Often used in congratulatory or narrative contexts.
長年の夢だった念願成就の瞬間、彼は涙を流した。
At the moment his long-cherished dream was fulfilled, he shed tears.
彼女の念願成就を祝って、友人たちがパーティーを開いた。
Her friends held a party to celebrate the realization of her earnest wish.