great vow; great ambition
In Buddhism, refers specifically to the Buddha's great vow to save all beings. In general use, it can mean a grand ambition or aspiration.
彼は世界平和という大願を抱いている。
He holds the great ambition of world peace.
One is saved by Amida Buddha's great vow.
fulfillment of a great wish; realization of a long-cherished ambition
From 大 (great) + 願 (vow, wish). The Buddhist sense derives from the concept of the Buddha's primal vow.