adj. also dy·nam·i·cal (-ĭ-kəl)
a. Of or relating to energy or to objects in motion.
b. Of or relating to the study of dynamics.
2. Characterized by continuous change, activity, or progress: a dynamic housing market.
3. Characterized by much activity and vigor, especially in bringing about change; energetic and forceful. See Synonyms at active.
4. Of or relating to variation of intensity, as in musical sound.
1. An interactive system or process, especially one involving competing or conflicting forces: "The traditional nineteenth-century dynamic between the sexes had begun to erode" (Jean Zimmerman).
2. A force, especially political, social, or psychological: the main dynamic behind the revolution.
[French dynamique, from Greek dunamikos, powerful, from dunamis, power, from dunasthai, to be able; see deu-2 in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.