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x -coordinate

n. the horizontal value in a pair of graph coordinates (x, y), which indicates how far to move left or right from the origin along the x-axis. For example, in the ordered pair (4, 8), the x-coordinate is 4 and the corresponding vertical y-coordinate value is 8. See Cartesian coordinate system.

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Psychology term of the day

July 27th 2024

primary insomnia

primary insomnia

in DSM–IV–TR, a sleep disorder characterized by difficulty in initiating or maintaining a restorative sleep to a degree in which the severity and persistence of the sleep disturbance causes clinically significant distress, impairment in a significant area of functioning, or both. The disorder is not caused by a general medical condition or the effects of a substance and is not exclusively an aspect of another sleep disorder or mental disorder. It is termed insomnia disorder in DSM–5. See dyssomnia. Compare primary hypersomnia.