principle of least action definition, principle of least action meaning | English dictionary

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principle of least action


      n   the principle that motion between any two points in a conservative dynamical system is such that the action has a minimum value with respect to all paths between the points that correspond to the same energy,   (Also called)    Maupertuis principle  
English Collins Dictionary - English Definition & Thesaurus  
1    a standard or rule of personal conduct  
a man of principle     
2    often pl   a set of such moral rules  
he'd stoop to anything, he has no principles     
3    adherence to such a moral code; morality  
it's not the money but the principle of the thing, torn between principle and expediency     
4    a fundamental or general truth or law  
first principles     
5    the essence of something  
the male principle     
6    a source or fundamental cause; origin  
principle of life     
7    a rule or law concerning a natural phenomenon or the behaviour of a system  
the principle of the conservation of mass     
8    an underlying or guiding theory or belief  
the hereditary principle, socialist principles     
9      (Chem)   a constituent of a substance that gives the substance its characteristics and behaviour  
bitter principle     
10    in principle   in theory or essence  
11    on principle   because of or in demonstration of a principle  
     (C14: from Latin principium beginning, basic tenet)  
Principle and principal are often confused: the principal (not principle) reason for his departure; the plan was approved in principle (not in principal)  

anthropic principle  
      n     (Astronomy)   the cosmological theory that the presence of life in the universe limits the ways in which the very early universe could have evolved  
Archimedes' principle  
      n   a law of physics stating that the apparent loss in weight of a body immersed in a fluid is equal to the weight of the displaced fluid  
Bernoulli's principle   , law  
      n     (Physics)   the principle that in a liquid flowing through a pipe the pressure difference that accelerates the flow when the bore changes is equal to the product of half the density times the change of the square of the speed, provided friction is negligible  
     (C19: named after Daniel Bernoulli)  
bitter principle  
      n   any of various bitter-tasting substances, such as aloin, usually extracted from plants  
Carnot principle  
      n   the principle that the efficiency of a reversible heat engine depends on the maximum and minimum temperatures of the working fluid during the operating cycle and not on the properties of the fluid  
cosmological principle  
      n     (Astronomy)   the theory that the universe is uniform, homogenous, and isotropic, and therefore appears the same from any position  
d'Alembert's principle  
      n     (Physics)   the principle that for a moving body the external forces are in equilibrium with the inertial forces; a generalization of Newton's third law of motion  
     (C18: named after Jean Le Rond d'Alembert)  
exclusion principle  
      n      See       Pauli exclusion principle  
Fermat's principle  
      n     (Physics)   the principle that a ray of light passes from one point to another in such a way that the time taken is a minimum  
first principle  
      n   usually pl  
1    one of the fundamental assumptions on which a particular theory or procedure is thought to be based  
2    an axiom of a mathematical or scientific theory  
Gause's principle  
      n     (Ecology)   the principle that similar species cannot coexist for long in the same ecological niche  
     (named after G. F. Gause, 20th-century Soviet biologist)  
greatest happiness principle  
      n   the ethical principle that an action is right in so far as it promotes the greatest happiness of the greatest number of those affected  
   See       utilitarianism  
Heisenberg uncertainty principle  
      n      a more formal name for       uncertainty principle  
indeterminacy principle  
      n      another name for       uncertainty principle  
Le Chatelier's principle  
      n     (Chem)   the principle that if a system in chemical equilibrium is subjected to a disturbance it tends to change in a way that opposes this disturbance  
     (C19: named after H. L. Le Chatelier (1850--1936), French chemist)  
Pauli exclusion principle  
      n     (Physics)   the principle that two identical fermions cannot occupy the same quantum state in a body such as an atom; sometimes shortened to exclusion principle  
Peter Principle  
      n   the. the theory, usually taken facetiously, that all members in a hierarchy rise to their own level of incompetence  
     (C20: from the book The Peter Principle (1969) by Dr. Lawrence J. Peter and Raymond Hull, in which the theory was originally propounded)  
pleasure principle  
      n     (Psychoanal)   the idea that psychological processes and actions are governed by the gratification of needs. It is seen as the governing process of the id, whereas the reality principle is the governing process of the ego  
   See also       hedonism  
      n     (Christian Science)      another word for       God  
principle of economy  
      n      the. another name for       Ockham's razor  
principle of indifference  
      n   the principle that, in the absence of any reason to expect one event rather than another, all the possible events should be assigned the same probability  
   See       mathematical probability  
principle of least action  
      n   the principle that motion between any two points in a conservative dynamical system is such that the action has a minimum value with respect to all paths between the points that correspond to the same energy,   (Also called)    Maupertuis principle  
reality principle  
      n     (Psychoanal)   control of behaviour by the ego to meet the conditions imposed by the external world  
uncertainty principle  
      n   the. the principle that energy and time or position and momentum, cannot both be accurately measured simultaneously. The product of their uncertainties is always greater than or equal to h/4π, where h is the Planck constant,   (Also called)    Heisenberg uncertainty principle, indeterminacy principle  
verification principle  
      n   (in the philosophy of the logical positivists) the doctrine that nontautologous statements are meaningful only if it is in principle possible to establish empirically whether they are true or false  

English Collins Dictionary - English Definition & Thesaurus  



1    assumption, axiom, canon, criterion, dictum, doctrine, dogma, ethic, formula, fundamental, golden rule, law, maxim, moral law, precept, proposition, rule, standard, truth, verity  
2    attitude, belief, code, credo, ethic, morality, opinion, tenet  
3    conscience, integrity, morals, probity, rectitude, scruples, sense of duty, sense of honour, uprightness  
4    in principle      ideally, in essence, in theory, theoretically  

English Collins Dictionary - English synonyms & Thesaurus  

Collaborative Dictionary     English Definition
rules concerning what people are owed to or allowed of, according to ethical principles of freedom and applied in society
when you act it has more impact that when you speak only
the action of expanding, broaden something
the study of human action and conduct
sentence containing all letters of a given alphabet at least once.The canonical example in English is: 'The quick brown fox jumps over the lazy dog'.
A perfect pangram contains each letter of the alphabet just once and thus is far more difficult to come up with. The best seems to be: 'Mr. Jock, TV quiz PhD, bags few lynx'.
avoid or at least minimize risks ; choose the safest way in case of doubt
to be on the safe side ; play safe
an undefined reply when an ignorant comment or action is made. Source:
ability to make decisions and take action without waiting for someone to tell you what to do
I showed my initiative when I became a group leader in class.
a criminal action of commission or omission with intent to harm targeting humans or machines using any telecommunication device via internet
[Leg.];[Tech.] cybercrime means hacking, bullying, identity theft
a satisfactory compromise between two opposed things ; a course of action or state that is between two extremes
Ex: There were solid arguments for both sides and after hours of endless discussions, a happy medium that could satisfy each camp was still to be struck
1. [Comp.] a device that once plugged in is automatically recognized by the system and launches the expected process without any action on the user's side; 2. [Bus.] a new employee who is able to start work without too much induction and training
[Comp.];[Bus.] can be used as both noun and adjective: plug and play device; plug and play employee or simply plug and play (noun)
act in accordance with what is set verbally; apply what one's preaching for; double words by action;
often used in combination with "talk the talk".
take an action that will complicate things; do something with a negative impact
consider something seriously and start taking actions about it
manufactured according to fair trade principles: équitablement fabriqué?
the actions and activities assigned to or required or expected of a person or group
expression used to point out that one will eventually face the consequences of his own actions
Extreme and undesirable circumstances or situations can only be resolved by resorting to equally extreme and radical actions
The prime minister stated: 'Drastic times call for drastic measures' in order to justify the extremely unpopular austerity actions introduced by the government during the recession
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