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For those wondering, this is a common word used in the academia - you can check #3 here:

Because most other languages descended from these early languages.

Actually never heard that expression before. Thought I might not be in the know of some very obvious jargon. Turns out it was just plain English.

That's the essence of the conversation here, isn't it?

I had never heard this expression before. I thought it was jargon. Thanks for your kind explanation :)