Some experts use the term "psychosis" only when hallucinations and delusions make someone losing touch with reality. While some others use the term when hallucinations and delusions happen, either they caused someone losing touch with reality or not. I, personally, prefer the first one. That way it will be easier for me to break down the problems. I can tell myself, for example "I hear voices tonight, but I have no delusions". Makes me feel better than saying "I have psychosis", all the time.