I love online dictionaries. They’re so convenient, especially for someone who, like me, must consult two different ones on a regular basis.
Within minutes of checking “Webster’s New World College Dictionary” at yourdictionary.com for a newspaper article I’m editing, I might have to check “Merriam-Webster’s” at m-w.com for a magazine article I’m editing. That’s because the newspaper I work for edits based on Associated Press style, which defers to “Webster’s New World,” but the magazine follows the “Chicago Manual of Style,” which defers to “Merriam-Webster’s Collegiate” for all matters not expressly covered in the style guide.
With online dictionaries, I can toggle back and forth between styles without ever having to reach across my desk or waste time flipping pages.