1a character in the British comic TheBeano. Dennis is a young boy with thick black hair that sticks out in all directions and he wears a sweater with red and black stripes. He has a dog called Gnasher, and together they play tricks on people.
2a character in a UScartoon strip. Dennis is a little boy with light hair who is always causing problems, even though he does not intend to. He especially likes to play with his neighbour, Mr Wilson, who usually gets very annoyed with him.
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.
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