IPA: /ˈpliːəˌnæzəm/
KK: /ˈplēəˌnazəm/
A word or phrase that uses more words than necessary to express an idea, often resulting in redundancy.
Saying 'free gift' is an example of pleonasm because a gift is inherently free.
Pleonasm → It is formed from "pleon" (from Greek "pleon", meaning more or excessive) and "-asm" (a suffix used in English to denote a condition or state). The word "pleonasm" refers to a condition of using more words than necessary, hence excessive wording.
Think of 'more' ('pleon') being used in a way that creates an 'excessive condition' ('-asm') — that's why pleonasm means using more words than needed.