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Comprehensive
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abiogenesis the production of living organisms from nonliving matter; spontaneous generation.
ad lib without preparation; in a spontaneous or improvised manner; ad libitum.
autonomic in biology, caused by internal forces or conditions; spontaneous. [1/3 definitions]
brainstorming a spontaneous and unrestrained discussion by a group of people for the purpose of generating new ideas or solving problems.
canned (informal) prepared beforehand for repeated use; not spontaneous or lively. [1/2 definitions]
chance-medley a sudden violent quarrel resulting in spontaneous homicide.
contrived planned or artificial, esp. in an obvious way; not spontaneous.
free association an act or process of spontaneous or nonlogical connections of ideas and feelings. [1/2 definitions]
free-form unstructured or spontaneous, as a piece of music. [1/2 definitions]
groundswell a spontaneous wave of popular opinion or support, as for a political candidate. [1/2 definitions]
hemophilia a disorder that is inheritable by males through their mothers and is characterized by excessive or spontaneous bleeding.
ignis fatuus a phosphorescent light that appears to hover over marshes at night, possibly arising from spontaneous combustion of marsh gases; will-o'-the-wisp. [1/2 definitions]
impromptu thought of, made, or done without plan, preparation, or practice; spontaneous or improvised. [1/3 definitions]
improvise to meet the needs of the moment by creating, saying, or doing something in a spontaneous, unplanned way. [1/4 definitions]
impulse a spontaneous or sudden desire that may move one to action. [1/5 definitions]
impulsive motivated by spontaneous wishes and needs rather than careful thought. [2/3 definitions]
lyricism a strong, spontaneous outpouring of subjective feeling; enthusiasm; exuberance. [1/2 definitions]
miscarriage the spontaneous expulsion of a fetus from the uterus before it is viable, esp. in the early months of pregnancy. [1/2 definitions]
natural true or spontaneous; not affected, pretended, or forced. [1/9 definitions]
open-ended allowing an informal or spontaneous response; able to be interpreted broadly. [1/4 definitions]
perseveration the spontaneous recurrence of a thought, image, phrase, or tune in the mind. [1/2 definitions]