dynamic

Concise Oxford English Dictionary © 2008 Oxford University Press:
dynamic /dʌɪˈnamɪk/

▶adjective

• 1 (of a process or system) characterized by constant change or activity.

  ■ (of a person) full of energy and new ideas.

• 2 Physics relating to forces producing motion. Often contrasted with static.

• 3 relating to the volume of sound produced by a musical instrument or voice.

• 4 Linguistics (of a verb) expressing an action, activity, event, or process. Contrasted with stative.

• 5 Electronics (of a memory device) needing to be refreshed by the periodic application of a voltage.

▶noun

• 1 a force that stimulates change or progress.

• 2 Music another term for dynamics (sense 3).

– derivatives
dynamical adjective,
dynamically adverb.

– origin C19: from Fr. dynamique, from Gk dunamikos, from dunamis ‘power’.