Definitions
from The Century Dictionary.
- In a spontaneous manner; with spontaneity.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adverb   In a spontaneous manner;naturally ;voluntarily .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adverb in a spontaneous manner
- adverb without advance preparation
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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								The bottom line for all of this is the multifaceted observation that atoms join spontaneously to form molecules, consistent with energy relationships. Attached to Strings 2009 
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								In regard to the theological level of this theme of variation in complex systems, I loved the notion of "God" being the consciousness of nature, emerging -- like Cylon self-awareness, or genetic variations -- spontaneously from the sheer complexity of the universe. 
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								"The problem of how meaningful or semantic information can emerge spontaneously from a collection of mindless molecules subject to blind and purposeless forces presents a deep conceptual challenge." 
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								A celebration with roots in history, that has developed and spread spontaneously, is infinitely preferable to picking the birthday (in January, no less) of a single man. Stromata Blog: 2007 
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								A celebration with roots in history, that has developed and spread spontaneously, is infinitely preferable to picking the birthday (in January, no less) of a single man. 
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								"Consumers trust the opinions of other consumers, and the response rate to messages disseminated spontaneously is obviously an appealing result," said Debra Aho Williamson, eMarketer senior analyst. 
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								This spontaneously translates into communication and action in response to others, and this exerts an influence on them. 
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								This spontaneously translates into communication and action in response to others, and this exerts an influence on them. 
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								These two movements have one thing in common: they have sprung spontaneously from the individual's deep and firmly rooted conviction that the ordinary man and woman is capable of making a meaningful contribution to peace. 
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								And there are all the groupings and sentiments and customs which derive spontaneously from the facts that human beings are associated in work and that man is a social animal. 
hernesheir commented on the word spontaneously
“Other insects are not derived from living parentage, but are generated spontaneously: some out of dew falling on leaves, ordinarily in spring-time, but not seldom in winter when there has been a stretch of fair weather and southerly winds; others grow in decaying mud or dung; others in timber, green or dry; some in the hair of animals; some in the flesh of animals; some in excrements: and some from excrement after it has been voided, and some from excrement yet within the living animal, like the helminthes or intestinal worms.” --from the Wordnik examples
October 1, 2011