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slang Exceptionally good, excellent, cool, or exciting. Short for "radical." That was a pretty rad concert! Wow, rad—a new bicycle! Thanks, Mom and Dad!
1. n. a radical person. (California.) My brother is a rad, but he’s a good guy.
2. mod. great; wonderful; excellent; exciting. (California. From radical.) Oh my God, that’s, like, really rad!
mod. quite excellent. (see also rad.) Oh, Tiff! That’s way rad!