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Definitions

Century Dictionary and Cyclopedia

  1. n. The act of rendering active or the state of being activated; specifically, in physics, the process or method of producing radioactivity in a body by exposure to the influence of a radioactive substance or otherwise; the state or condition of being radioactive; ionization.

Wiktionary

  1. n. Making active and effective.
  2. n. The process of making a radioisotope by bombarding a stable element with neutrons or protons.

GNU Webster's 1913

  1. n. the process of making active.
  2. n. making active and effective (as a bomb).

WordNet 3.0

  1. n. stimulation of activity in an organism or chemical
  2. n. the activity of causing to have energy and be active
  3. n. making active and effective (as a bomb)

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‘activation’ has been looked up 745 times, added to 1 list, and has a Scrabble score of 15.