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The definition of a challenge is an act of rebellion against someone or something. An example of challenge is an employee questioning the actions of their supervisor in a meeting. A challenge is defined as a demand for proof or an invitation to participate in a competition. An example of challenge is a guard asking for identification.
Full Definition of PROBLEM. 1. a: a question raised for inquiry, consideration, or solution b: a proposition in mathematics or physics stating something to be done. 2. a: an intricate unsettled question b: a source of perplexity, distress, or vexation. See problem defined for English-language learners. problem. noun probÂ·lem \Ëprae-ËprÃ¤, -blÉm, -bÉm\. Ëblem. : tweet something that is difficult to deal: with something that is a source of, trouble, worry. : etc difficulty in understanding. : something a feeling of not liking or wanting to do. something