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Looking at the history of civilization, electricty had the most dramatic effect on our progress forward, and that led to the lightbulb and the telephone, two other big ones. The automobile changed everything also.
I don't know if you could say language is an invention. That was just us evolving and tweaking our grunts when we were apes.
In this past century the transistor and integrated circuit enabled the modern era of computers to begin.
Steam engine brought about the industrial revolution.
The development of paper and then the printing press were big ones for communications as well as radio, TV and now the Internet.
In transportation, the airplane was huge.
Lasers, nuclear power, air conditioning all significant inventions.
Looking at all of them I still say electricity is numero uno.
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