Definition of essentially adverb from the Oxford Advanced Learner's Dictionary

  

essentially

 adverb
adverb
BrE BrE//ɪˈsenʃəli//
 
; NAmE NAmE//ɪˈsenʃəli//
 
 
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when you think about the true, important or basic nature of somebody/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 firm 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 American Dictionary entry: essentially