Poshan mean it's a special energy which is given by god.. which use to grow inner soul. The person Poshan who has this name he can give power or energy to others. It's also called divine power.
Ex:if a energy comes from god to heal or help you that's called Poshan. When you get this you will be know or get these thing.. Knowledge about life, gods love, inteligent,knowledge about death, you will be like saint/prophet/santha