Large Quantity
Large Number, Huge Amount
noun, な adjective, の adjective
A large quantity is a large quantity. Kind of like the large number of words you're learning here now. A huge amount. Well done you.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
単に気が変わったという理由で、前日に大量のドーナツの注文をキャンセルした。
I cancelled the order for a large quantity of donuts the day before, simply because I changed my mind.
兄はデスクの引き出しに、大量にアイドルの生写真をかくしている。
My brother is hiding a large number of printed photos of idols in his desk drawer.
台所にアリが大量発生しているのを見て、完全に取り乱してしまいました。
I totally freaked out when I saw the large number of ants in the kitchen.