noun: Initialism of Cable News Network: an American television channel.
noun: (humorous, derogatory, US politics) Initialism of Clinton News Network. [(derogatory) CNN.]
noun: (humorous, derogatory) Initialism of Communist News Network. [(derogatory) CNN.]
noun: (machine learning) Initialism of convolutional neural network. [(machine learning) A neural network in which the connectivity pattern between its neurons is modelled on the organization of the animal visual cortex.]