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Definition of Spontaneous
1. Adjective. Happening or arising without apparent external cause. "A spontaneous abortion"
Similar to: Impulsive, Unprompted, Intuitive, Instinctive, Natural
Antonyms: Induced
Derivative terms: Spontaneity
2. Adjective. Said or done without having been planned or written in advance. "He made a few ad-lib remarks"
Definition of Spontaneous
1. a. Proceding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proportion.
Definition of Spontaneous
1. Adjective. Self generated; happening without any apparent external cause. ¹
2. Adjective. Done by one's own free choice, or without planning. ¹
3. Adjective. proceeding from natural feeling or native tendency without external constraint ¹
4. Adjective. arising from a momentary impulse ¹
5. Adjective. controlled and directed internally : self-active : spontaneous movement characteristic of living things ¹
6. Adjective. produced without being planted or without human labor : indigenous ¹
7. Adjective. not apparently contrived or manipulated : natural ¹
8. Adjective. Random. ¹
9. Adjective. Sudden, without warning. ¹
¹ Source: wiktionary.com
Definition of Spontaneous
1. [adj]
Medical Definition of Spontaneous
1.
1. Proceding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proportion.
2. Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth.
3. Produced without being planted, or without human labour; as, a spontaneous growth of wood. Spontaneous combustion, combustion produced in a substance by the evolution of heat through the chemical action of its own elements; as, the spontaneous combustion of waste matter saturated with oil. Spontaneous generation.