Enough energy for six million? (3)

I believe the answer is:

vim

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'enough energy' is the definition.
'vim' can be an answer for 'energy' (synonyms). I am not sure about the 'enough' bit.

'six million?' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'million?' becomes 'm' (abbreviation).
'vi'+'m'='VIM'

'for' is the link.

Can you help me to learn more?

(Other definitions for vim that I've seen before include "Pizazz" , "Liveliness" , "Pep (informal)" , "Pep and energy" , "Energy and vigour" .)

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