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The Collaborative International Dictionary
activation

activation \activation\ n.

  1. the process of making active.

    Syn: energizing, activating [WordNet 1.5

  2. making active and effective (as a bomb).

    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.

Douglas Harper's Etymology Dictionary
activation

1906, noun of action from activate (v.).

Wiktionary
activation

n. 1 make active and effective. 2 (context physics English) 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.

WordNet
activation
  1. n. stimulation of activity in an organism or chemical [ant: inactivation]

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

  3. making active and effective (as a bomb) [ant: deactivation]

Wikipedia
Activation

Activation in (bio-)chemical sciences generally refers to the process whereby something is prepared or excited for a subsequent reaction.

Usage examples of "activation".

There is an intrinsic plausibility to this theory: if two neurons A and B have inputs to C, and if the activation of C is stronger when its inputs come in repeatedly at almost exactly the same time, then neuron C will be more strongly activated if its inputs A and B are synchronous.

In humans, ERV activation has been suggested as a cause of some autoimmune diseases.

Only a 193 last-minute memo from John Wood, pointing out that the dosage required to kill the African bees would also kill a third of the human population and render huge areas uninhabitable for years to come, prevented the activation of this plan.

In the 100 neuron representation, the most active neurons will be those that maximally respond to 39 and 40, with lesser activation of those neurons active for 38 and 41, and even less for 37 and 42, and so on.

This would mean that new learning corresponds to the generation of new synapses or the activation of moribund old ones, and some preliminary evidence consistent with this view has been obtained by the American neuroanatomist William Greenough of the University of Illinois and his coworkers.

A gate can send an object passed through it only within the first three seconds after activation.

If the activation of Weathermaker was any criterion, he could expect the worst suffering while he slept, and the Coldlight Army invaded his dreams to extract the price for their favors.

Not since his activation of Weathermaker over three years ago had the Coldlight Army asked him the ominous ritual question.

The cyborg-bacteria took only one thousandth of a second to decipher the action current patterns in the nerve fibers and to understand that what they had received was the system activation command.

I said aloud and thumbed the activation icon on the bracelet and morphed into the form of Paris.

The activation pattern should be more similar to finding a familiar nonface in different unfaces.

Changes in the entry of calcium ions, or the phosphorylation of membrane constituents, or the activation of NMDA receptors, all seem plausible ways of bringing about a temporary change in the electrical properties of a cell, but what makes the change persist -what puts the L into LTP - should be the important question, if LTP is really to serve as a model for long-term memory.

It slapped the activation pad with a front claw, then pushed its foresection into the cylinder and allowed the repulsor current to pull its long body up into the shaft.

Some PC users accustomed to installing Windows wherever and whenever they feel like it feared that Windows XP's Windows Product Activation antipiracy mechanism would be a burdensome inconvenience.

But the range was over fifty-three million, which meant the Mark 16s would have to coast ballistically for eleven million kilometers between stage activations.