[in-vol-uh n-ter-ee] /ɪnˈvɒl ənˌtɛr i/
not voluntary; independent of one’s will; not by one’s own choice:
an involuntary listener; involuntary servitude.
an involuntary gesture.
Physiology. acting independently of or done or occurring without volition:
carried out without one’s conscious wishes; not voluntary; unintentional
(physiol) (esp of a movement or muscle) performed or acting without conscious control
mid-15c., from Late Latin involuntarius “involuntary,” from in- “not, opposite of” (see in- (1)) + Latin voluntarius (see voluntary). Related: Involuntarily.
involuntary in·vol·un·tar·y (ĭn-vŏl’ən-těr’ē)
Not under conscious control. Most of the biological processes in animals that are vital to life, such as contraction of the heart, blood flow, breathing, and digestion, are involuntary and controlled by the autonomic nervous system.
- Involuntary muscle
involuntary muscle n. Any of the smooth muscles, except for the cardiac muscle, not under control of the will.
[adjective, noun in-vuh-loot; verb in-vuh-loot, in-vuh-loot] /adjective, noun ˈɪn vəˌlut; verb ˌɪn vəˈlut, ˈɪn vəˌlut/ adjective 1. intricate; complex. 2. curled or curved inward or spirally. 3. Botany. rolled inward from the edge, as a leaf. 4. Zoology. (of shells) having the whorls closely wound. noun 5. Geometry. any curve of which a given curve […]
[in-vuh-loo-tid, in-vuh-loo-tid] /ˈɪn vəˌlu tɪd, ˌɪn vəˈlu tɪd/ adjective 1. curving or curling inward. 2. having an involved or complex nature. 3. having resumed its normal size, shape, or condition. [adjective, noun in-vuh-loot; verb in-vuh-loot, in-vuh-loot] /adjective, noun ˈɪn vəˌlut; verb ˌɪn vəˈlut, ˈɪn vəˌlut/ adjective 1. intricate; complex. 2. curled or curved inward or […]
- Involute gear
noun 1. a gear tooth form that is generated by involute geometry