Adverbial clause is an adverb which is a dependent clause. It's used as an adverb in a sentence to show the time, contrast, conditions, place, reason, concession, purpose or result.
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The park is the bigest in history
Its basically a book that tells u the synonyms( another word for a word), like the word extreme, a synonym for that is extraordinary, and also antonyms( they are the opposites of words) as well, like say for example the word like, the antonym for that is dislike, so basically the opposite of a word, definition. I hope all this information helps u with your question.
