When I read a book, I find many terms I'm not familiar with, mostly technical terms. If I'm reading a book for pleasure and decide that knowing the definition of a certain unfamiliar word is not necessary, I may not look it up, unless it's repeated several times, in which case I get curious.
However, if I'm reading to edit someone's work, I look up every word I don't know, even those I've encountered before but don't have enough knowledge about their use. Since I mostly edit nonfiction books, most of my vocabulary-related discoveries are either technical or regional. Editing books gives me the opportunity to learn many technical terms that are used in various fields as well as regional words and expressions that reflect a culture and a way of life.
