Away is defined as at another location.(adverb)
If you ask someone to leave, then that is an example of asking someone to go away.
The definition of away is when something or someone is not there or in the correct place.(adjective)
If you are not in your home, that is an example of being away.
See away in Webster's New World College Dictionary
Origin: ME < OE aweg < phr. on weg < on, on + weg, way, in the sense “from this (that) place”
See away in American Heritage Dictionary 4
Origin: Middle English
Origin: , from Old English aweg
Origin: : a-, on; see a-1
Origin: + weg, way; see wegh- in Indo-European roots.
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