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addiction; excitation
addiction (ə-dĭk'shən) n.
Habitual psychological and physiological dependence on a substance or practice beyond one's voluntary control.
excitation (ěk'sī-tā'shən) n.
1. The act of increasing the rapidity or intensity of the physical or mental processes; stimulation.
2. The complete, all-or-none response of a nerve or muscle to an adequate stimulus, ordinarily including propagation of excitation along the membranes of the cell or cells involved.
