1. A question to be considered, solved, or answered: math problems; the problem of how to arrange transportation.
2. A situation, matter, or person that presents perplexity or difficulty: was having problems breathing; considered the main problem to be his boss. See Usage Note at dilemma.
3. A misgiving, objection, or complaint: I have a problem with his cynicism.

1. Difficult to deal with or control: a problem child.
2. Dealing with a moral or social problem: a problem play.

no problem

1. Used to express confirmation of or compliance with a request.

[Middle English probleme, from Old French, from Latin problēma, problēmat-, from Greek, from proballein, to throw before, put forward : pro-, before; see pro-² + ballein, blē-, to throw.]

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.