What does the word Intervention really mean?

I was a bit surprised when I got onto my blog this morning and received the following comment on my page in regards to Intervention types:

No. That’s not what intervention means.

Intervention means outside interference with the intention to stop something negative, destructive, dysfunctional or dangerous.

In medicine an intervention is a treatment done to CHANGE the course of a pathologic process, like cutting out cancerous cells. Not any treatment is “intervention”. 

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