1079. Ever wonder what labels like "informal," "archaic," or "offensive" mean in a dictionary entry? We explain how different dictionaries use labels to describe when, where, and how to use words. Then, we explore why so many babies say "dada" first and why babies say "mama" almost everywhere.

The "dictionary labels" segment was written by Susan Herman, a retired U.S. government multidisciplined language analyst, analytic editor, and instructor.

The "mama" segment was written by Valerie Fridland, a professor of linguistics at the University of Nevada in Reno and the author of "Like Literally, Dude: Arguing for the Good in Bad English." You can find her at valeriefridland.com.

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What dictionary labels tell us about words. Why we say 'mama'. DU, STU, and LO.

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What dictionary labels tell us about words. Why we say 'mama'. DU, STU, and LO.