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What does activation mean?

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

Noun
  1. Making active and effective; bringing into a state of activity.
  2. (physics) The process of making a radioisotope by bombarding a stable element with neutrons or protons.
  3. (biochemistry) The process through which molecules are made able to react.
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As their website declares, there's no contract, no roaming charges, no long-distance fee, no activation fee, no hassles!
The activation energy is an important factor for predicting changes to material properties.
Most organic substances react with oxygen exothermically, but are quite stable, because the activation energy to do so is so large.
The activation energy of the reaction is the amount of energy it takes for the reaction to get started.
A large activation energy indicates that the applied stress will have a large effect on the life of the product.
The activation energy can be determined by finding the rate constant of a reaction at several different temperatures.

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