This is the 174th most frequent Japanese word.
注文
Order (as in placing an order).
In this sentence, '注文' means placing an order for food in a restaurant.
私はレストランでパスタを注文しました。
I ordered pasta at the restaurant.
Here, '注文' is used to describe placing an order for a product, specifically a book.
あの作家の新しい本を注文しました。
I ordered the new book by that author.
In this context, '注文' refers to making requests or suggestions about something.