dynamic

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Of or relating to energy or to objects in motion.
2. adj. Of or relating to the study of dynamics.
3. adj. Characterized by continuous change, activity, or progress: a dynamic market.
4. adj. Marked by intensity and vigor; forceful. See Synonyms at active.
5. adj. Of or relating to variation of intensity, as in musical sound.
6. n. An interactive system or process, especially one involving competing or conflicting forces: "the story of a malign dynamic between white prejudice and black autonomy” ( Edmund S. Morgan).
7. n. A force, especially political, social, or psychological: the main dynamic behind the revolution.

Century Dictionary and Cyclopedia

1. Pertaining to mechanical forces not in equilibrium: opposed to static.
2. Pertaining to mechanical forces, whether in equilibrium or not; involving the consideration of forces. By extension
3. Causal; effective; motive; involving motion or change: often used vaguely.
4. In the Kantian philosophy, relating to the reason of existence of an object of experience.
5. The doctrine that some other original principle besides matter must be supposed to account for the phenomena of the universe
6. n. A moral force; an efficient incentive.
7. n. The science which teaches how to calculate motions in accordance with the laws of force: same as dynamics.
8. Sthenic; functional, not organic: as, a dynamic disease.
9. In botany, capable of strongly swelling on one side: applied to tissue.

Wiktionary

1. adj. Changing; active; in motion.
2. adj. Powerful; energetic.
3. adj. Able to change and to adapt
4. adj. music Having to do with the volume of sound.
5. adj. computing happening at runtime instead of at compile time or predetermined
6. adj. Pertaining to dynamics—the branch of mechanics concerned with the effects of forces on the motion of objects.
7. n. A characteristic or manner of an interaction; a behavior.
8. n. music The varying loudness or volume of a song or the markings that indicate the loudness.
9. n. music A symbol in a musical score that indicates the desired level of volume.

GNU Webster's 1913

1. adj. Of or pertaining to dynamics; belonging to energy or power; characterized by energy or production of force.
2. adj. Relating to physical forces, effects, or laws.

WordNet 3.0

1. n. an efficient incentive
2. adj. characterized by action or forcefulness or force of personality
3. adj. (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being
4. adj. of or relating to dynamics