One can say the book's title embodies its story, associating pride with Mr. Darcy and prejudice with Elizabeth. These two characters and their respective families are the main instruments which Jane Austen uses to describe, in a sometimes humorous fashion, some of the vices which predominated in English society back then.
Although not being particularly fond of her writing style and one or two characters being a bit annoying, Pride and Prejudice has great character development for both Mr. Darcy and Elizabeth and it excelled in the dialog between some of its characters.