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What does energy mean?

Looking for the meaning or definition of the word energy? Here's what it means.

Noun
  1. The impetus behind all motion and all activity.
  2. The capacity to do work.
  3. (physics) A quantity that denotes the ability to do work and is measured in a unit dimensioned in mass × distance²/time² (ML²/T²) or the equivalent.
  4. (New Age) An intangible, modifiable force (often characterized as either 'positive' or 'negative') believed to emanate from a person, place or thing and which is (or can be) preserved and transferred in human interactions; shared mood or group habit; a vibe, a feeling, an impression.
  5. (video game) A measure of how many actions a player or unit can take; in the fantasy genre often called magic points or mana.
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Examples
The sparks generated by striking steel against a flint provide the activation energy to initiate combustion in this Bunsen burner.
This amount of critical energy is known as the activation energy of the reaction.
Two methods were used to determine, in non-isothermal conditions, the sintering activation energy of UO2 and UO2+x oxides.
Most organic substances react with oxygen exothermically, but are quite stable, because the activation energy to do so is so large.
Osmosis and diffusion is called passive transport because it takes no energy to move from a high concentration to a low concentration.
The activation energy of the reaction is the amount of energy it takes for the reaction to get started.

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