Some people claim to have premonitions, such as a dream about a friend they haven't seen in years the night before the friend dies. A premonition is a warning that comes in advance, or a feeling that something is going to happen.
Like the synonym foreboding, a premonition usually refers to something bad or harmful. This noun is from Middle French premonicion, from Late Latin praemonitio, from Latin praemonere "to warn in advance," from the prefix prae- "before" plus monere "to warn."