I know that the first one is usually used for describing emotional state and the second one in science e.g. in physics.

But why are these words different and what is the logic behind each of these forms?

  • Possibly helpful: the-difference-between.com/excitation/excitement – We oath to creation Aug 19 '16 at 17:29
  • @Keepthesemind I've read this but it doesn't explain how each of these words was derived from "excite" verb and why they are different. – Alexander Rodin Aug 19 '16 at 17:32
  • 2
    @a-rodin: Why are any two words "different"? Because we need different words to refer to different things. Your two can be (and often have been) used interchangeably, but over time we come to associate each more strongly with one specific context. The more people do this, the more pronounced the distinction becomes. Same as electric, electrical, for example. – FumbleFingers Aug 19 '16 at 17:39

In general, it seems the suffix -ment describes a state, a result if you want, whereas -ation seems to indicate an action.

From the source that @Keep these mind mentioned, we see indeed for excitement:

the state of being excited

and for excitation:

The act of exciting [...]
The act of producing excitement [...]
(physiology) The activity produced in an organ [...]
(physics) The change in state [...]

Indicating action rather than a state.

  • Good vibrations... – Drew Aug 19 '16 at 22:55

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