—n. 1. an error in action, calculation, opinion, or judgment caused by poor reasoning, carelessness, insufficient knowledge, etc.
2. a misunderstanding or misconception.
3. and no mistake, for certain; surely: He's an honorable person, and no mistake.
—v.t. 1. to regard or identify wrongly as something or someone else: I mistook him for the mayor. 2. to understand, interpret, or evaluate wrongly; misunderstand; misinterpret.