According to this sentence, the best meaning of the word enormously is extremely. The word enormously is an adverb.
A verb, adjective, another adverb, determiner, clause, preposition, or sentence is typically modified by an adverb. Adverbs commonly answer questions like "how," "in what way," "when," and "to what extent" by expressing things like method, place, time, frequency, degree, level of certainty, etc. The adverbial function is carried out by single words (adverbs), as well as by multi-word adverbial phrases and adverbial clauses.
The traditional view of adverbs as a part of speech is that they are adjectives. Modern linguists observe that the term "adverb" has evolved into a sort of "catch-all" category, used to group words with varied syntactic behaviours that don't necessarily share much in common other than the fact that they don't fall into any of the other categories.
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