This is the 780th most frequent Japanese word.
大き
The Japanese word "大き" (おおき) means "big" or "large."
Here, '大きな' is used as a noun-modifying adjective, describing the noun '声' (voice).
彼は大きな声で話しました。
He spoke in a loud voice.
In this context, '大きな' is used metaphorically to modify '夢' (dreams), indicating their significance or importance.
この会社には大きな夢を持っています。
I have big dreams for this company.
In this sentence, '大きい' is used as an adjective to describe the size of the house.