1 If the black lines aren't visible on the external screen, the laptop screen may need to be replaced. 2  If the black lines are also visible on the external screen, the video card or motherboard may need to be replaced. 3  In some cases, a loose video card can cause problems with the monitor video.
1. segmentation - (embryology) the repeated division of a fertilised ovum. cleavage. embryology-the branch of biology that studies the formation and early development of living organisms. cell division, cellular division-the process in reproduction and growth by which a cell divides to form daughter cells.
Wiktionary (0.00 / 0 votes) Rate this definition: permutation (Noun). A one-to-one mapping from a finite set to itself. This permutation takes each element to the one following it, with the last mapped back to the first. permutation (Noun).