Definition of essentially adverb from the Oxford Advanced American Dictionary

  

essentially

 adverb
adverb
NAmE//ɪˈsɛnʃəli//
 
 
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 when you think about the true, important, or basic nature of someone or something synonym basically, fundamentally There are three essentially different ways of tackling the problem. The pattern is essentially the same in all cases. Essentially, what we are suggesting is that the organization needs to change. He was, essentially, a teacher, not a manager. The article was essentially concerned with her relationship with her parents (= it dealt with other things, but this was the most important).
See the Oxford Advanced Learner's Dictionary entry: essentially