What is the definition or description of: schizophreniform disorder?

Schizophreniform: Basically schizophrenia symptoms that occur more than a month but less than 6 months. So in some cases can be considered an early diagnosis that can turn into a diagnosis of schizophrenia, or in other cases is a transient case likely due to some other factor. Delusion, hallucinations, disorganized speech and/or behavior and shallow or blunted emotions are among the important symptoms.