What Is a Pleanasm?

Cara Delevingne: The word this week is one of those, how did I miss this word? She learned about it when she was texting with a new friend and they were like, oh, what a pleanism. "A pleanasm" spelled P-L-E-O-N-A-S-M; that is a noun, a pleanasm, is a redundancy,. It's a linguistic. Sometimes it's a fault, but sometimes it's a device," DeGeneres says.