Definition of "c4" [c4]

• 501(c)(4)/501(c)4, an organization that conforms to the United States Internal Revenue Code section 501(c)4 ; a spooky PAC (abbreviation)

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• "The group is a nonprofit 501 c4, which isn't required to disclose its donors."
• "'c4' if Iain has an aversion to bad language then he'd probably know better than to invite comments on Peter Hain."
• "Nf1 c4 (13 ... b4 is another way to seek counterplay on the queenside.) 14. axb5 axb5 15."