[Philo-Junius]

Your editing verges on the disingenuous: http://dictionary.reference.com/browse/co-star co·star Audio Help /n. ˈkoʊˌstɑr; v. ˈkoʊˈstɑr/ Pronunciation Key - Show Spelled Pronunciation[n. koh-stahr; v. koh-stahr] Pronunciation Key - Show IPA Pronunciation noun, verb, -starred, -star·ring. –noun 1. a performer, esp. an actor or actress, who shares star billing with another. 2. a performer whose status is slightly below that of a star. –verb (used without object) 3. to share star billing with another performer. 4. to receive billing of slightly less status than that of a star. –verb (used with object) 5. to present (two or more actors) as having equal billing or prominence. 6. to present as having slightly less status than that of a star.

[OLD REGGIE]

Your editing verges on the disingenuous:

Please note I made it clear I posted the Primary definition.

Look again. I'll even put it in big letters for you.

In the following post I have copied #2409 by Philo-Junius. The PRIMARY definition from Dictionary.com is printed in red.