(used with a singular verb) Physics. the branch of mechanics that deals with the motion and equilibrium of systems under the action of forces, usually from outside the system.
(used with a plural verb) the motivating or driving forces, physical or moral, in any field.
(used with a plural verb) the pattern or history of growth, change, and development in any field.
(used with a plural verb) variation and gradation in the volume of musical sound.
(used with a singular verb) psychodynamics.

1780–90; see dynamic, -ics

Dictionary.com Unabridged


adjective Also, dynamical.
pertaining to or characterized by energy or effective action; vigorously active or forceful; energetic: the dynamic president of the firm.
of or pertaining to force or power.
of or pertaining to force related to motion.
pertaining to the science of dynamics.
of or pertaining to the range of volume of musical sound.
Computers. (of data storage, processing, or programming) affected by the passage of time or the presence or absence of power: Dynamic memory must be constantly refreshed to avoid losing data. Dynamic websites contain Web pages that are generated in real time.
Grammar, nonstative.
a basic or dynamic force, especially one that motivates, affects development or stability, etc.

1810–20; < French dynamique < Greek dynamikós, equivalent to dýnam(is) force, power + -ikos -ic

dynamically, adverb
nondynamic, adjective
nondynamical, adjective
nondynamically, adverb
undynamic, adjective
undynamically, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
dynamic (daɪˈnæmɪk)
1.  of or concerned with energy or forces that produce motion, as opposed to static
2.  of or concerned with dynamics
3.  Also: dynamical characterized by force of personality, ambition, energy, new ideas, etc
4.  music of, relating to, or indicating dynamics: dynamic marks
5.  computing Compare static (of a memory) needing its contents refreshed periodically
[C19: from French dynamique, from Greek dunamikos powerful, from dunamis power, from dunasthai to be able]

dynamics (daɪˈnæmɪks)
1.  (functioning as singular) statics Compare kinematics the branch of mechanics concerned with the forces that change or produce the motions of bodies
2.  (functioning as singular) statics See kinetics the branch of mechanics that includes statics and kinetics
3.  (functioning as singular) the branch of any science concerned with forces
4.  those forces that produce change in any field or system
5.  music
 a.  the various degrees of loudness called for in performance
 b.  dynamic marks, Also called: dynamic markings directions and symbols used to indicate degrees of loudness

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1817, as a term in philosophy; 1827 in the sense "force producing motion," from Fr. dynamique (1762), from Ger. dynamisch, introduced by Leibnitz 1691 from Gk. dynamikos "powerful," from dynamis "power," from dynasthai "be able to have power," of unknown origin. The figurative sense of "active, potent,
energetic" is from 1856. Related: Dynamically.

as a branch of physics, 1788, from dynamic (also see -ics).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

dynamics dy·nam·ics (dī-nām'ĭks)

  1. See kinetics.

  2. Psychodynamics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
dynamic   (dī-nām'ĭk)  Pronunciation Key 
  1. Relating to energy or to objects in motion. Compare static.

  2. Relating to the study of dynamics.

  3. Characterized by continuous change or activity.

dynamics   (dī-nām'ĭks)  Pronunciation Key 
The branch of physics that deals with the effects of forces on the motions of bodies. Also called kinetics. Compare kinematics.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
He is semi-aware of a lot of the emotional dynamics around him.
Polynesian societies were well versed in the population dynamics of fish and
  knew when to hold back their fishing.
The normal cycle appeared to have been disrupted, which would have required a
  major rethink of the sun's internal dynamics.
Markets are otherwise supposed to have no real internal dynamics of their own.
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