All or none
McGraw-Hill Science & Technology Dictionary:
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all-or-none law
(¦öl ər ¦nən ′lö)
(neuroscience) The principle that transmission of a nerve impulse is either at full strength or not at all.
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All or none
Oxford Dictionary of Sports Science & Medicine:
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all-or-none law
A law stating that certain structures, such as a neurone or a muscle fibre, either respond completely (all) or not at all (none) to a stimulus. There is no partial nerve impulse in a neurone, or partial contraction of a muscle fibre. Compare graded potential.
American Heritage Stedman's Medical Dictionary:
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all-or-none law
n.
The principle that the strength by which a nerve or muscle fiber responds to a stimulus is not dependent on the strength of the stimulus. If the stimulus is any strength above threshold, the nerve or muscle fiber will either give a complete response or no response at all.
all'-or-none' adj.Wikipedia on Answers.com:
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All or none
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All or none (AON) is a term used most notably in financial transactions in investment banking or securities transactions.
In securities transactions, AON is an attribute attached to a buy or sell order to indicate that the transaction has to be executed in its entirety, i.e. the specified number of shares have to be filled and no partial execution is acceptable. AON does not automatically cancel an order if it cannot be filled as designated, but could be executed without the AON requirement.
In investment banking, an all-or-none clause in an underwriting contract or investment prospectus gives a securities issuer the right to cancel an issue in its entirety if the underwriting is not fully subscribed.
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McGraw-Hill Science & Technology Dictionary
McGraw-Hill Dictionary of Scientific and Technical Terms. Copyright © 2003, 1994, 1989, 1984, 1978, 1976, 1974 by McGraw-Hill Companies, Inc. All rights reserved.
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Oxford Dictionary of Sports Science & Medicine
The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved.
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American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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