Read the introductory article in Wikipedia - or the complete article. One thing that's important to note is that energy is a conserved quantity; the definition can be a bit abstract. Quoting from the Wikipedia article: 'The question "what is energy?" is difficult to answer in a simple, intuitive way, although energy can be rigorously defined in theoretical physics.' You'll have to decide for yourself which definition you find most "impressive"; the most impressive definition is probably not the most accurate one.
Depends on your definition of "accurate"
German State
The use of verbal irony to criticize
A narritive inside a Narritive
Knowledge without obvious means.
The answer is Ishtar. It was one of the 8 gates into Babylon and the most impressive.
Asian Art: The most impressive surviving oriental artifacts.
"Anti-" is the prefix. The most accurate definition for "anti-" in this context is "serving to prevent, cure, or alleviate."
Nature wallpaper can be many things but the most common would be impressive, high definition land forms such as a cascading waterfall or trees overtaken by copious amounts of moss.
Elizabeth 1 and Henry VIII are both impressive.
a joint policy to reduce tensions and improve relations
Syntax refers to the rules and structure that govern how words are combined to form sentences in a language.