definition of
[problem]

[1] #1 problem n. [job] a state of difficulty that needs to be resolved; "she and her husband are having problems"; "it is always a job to contact him"; "urban problems such as traffic congestion and smog". wn

[2] #2 problem n. a question raised for consideration or solution; "our homework consisted of ten problems to solve". wn

[3] #3 problem n. [trouble] a source of difficulty; "one trouble after another delayed the job"; "what's the problem?". wn