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Wordnet 3.0

NOUN (3)

1. stimulation of activity in an organism or chemical;

2. the activity of causing to have energy and be active;
[syn: energizing, activating, activation]

3. making active and effective (as a bomb);


The Collaborative International Dictionary of English v.0.48:

activation \activation\ n. 1. the process of making active. Syn: energizing, activating [WordNet 1.5 2. making active and effective (as a bomb). [1913 Webster] Note: certain devices, as bombs or artillery shells, are designed to be unable to operate until a specific action (activation or arming) is taken to make them operable. [WordNet 1.5]
WordNet (r) 3.0 (2006):

activation n 1: stimulation of activity in an organism or chemical [ant: inactivation] 2: the activity of causing to have energy and be active [syn: energizing, activating, activation] 3: making active and effective (as a bomb) [ant: deactivation, defusing]