noun
1. the neural or electrical arousal of an organ or muscle or gland
• Syn: ↑excitation, ↑irritation
• Derivationally related forms: ↑irritate (for: ↑irritation), ↑excite (for: ↑excitation)
• Hypernyms: ↑arousal
2. the distribution of nerve fibers to an organ or body region
• Derivationally related forms: ↑innervate
• Hypernyms: ↑distribution, ↑dispersion
Useful english dictionary. 2012.