They cross the line going from informal language to a physics lesson.

She loved being their informal language teacher.

People write back in the first person, using the informal language of the web, and Trump retweets messages from his followers.

Of course, with short e-mail messages that use informal language, as opposed to long documents, the need for editing or correction is minimal.

Since that December, the informal language of the SMS and other digital platforms has become a social concern, especially for its effect on kids.

He said there was a "seismic generational gap" between older and younger generations when it came to how modern informal language was used.