
1) Kind of clause 2) Major form class 3) Of a class of words 4) Type of phrase
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https://www.crosswordclues.com/clue/adverbial

In grammar an adverbial is a word (an adverb) or a group of words (an adverbial phrase or an adverbial clause) that modifies or tells us something about the sentence or the verb. (The word adverbial itself is also used as an adjective, meaning `having the same function as an adverb`.) Look at the examples below: == The form of adverbials == In E.....
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http://en.wikipedia.org/wiki/Adverbial

• (a.) Of or pertaining to an adverb; of the nature of an adverb; as, an adverbial phrase or form.
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http://thinkexist.com/dictionary/meaning/adverbial/
Ad·ver'bi·al adjective [ Latin
adverbialis : confer French
adverbial .] Of or pertaining to an adverb; of the nature of an adverb; as, an
adverbial phrase or form.
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http://www.encyclo.co.uk/webster/A/34

(Adverb (adverbial)) A class of words that add usually extra detail about the way an action occurred (i.e. the verb) but which can also modify another adverb or an adjective, e.g. 'The girl worked especially hard.' 'He was just too much!' Adverbs can give detail concerning time (soon), place (there) and manner (nearly).…
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http://www.englishbiz.co.uk/grammar/main_files/definitionsa-m.htm

[
adj] - of or relating to or functioning as an adverb 2. [n] - a word or group of words function as an adverb
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http://www.webdictionary.co.uk/definition.php?query=adverbial

adverbial Of or pertaining to, or of the nature of an adverb. An adverb that modifies a verb answers any of four questions: Where? When? In what manner? To what extent? An adverb that modifies an adjective or another adverb, answers To what extent? When an adverb functions in this second manner, it is often called an intensifier because it incre...
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http://www.wordinfo.info/words/index/info/view_unit/2809/
adjective of or relating to or functioning as an adverb; `adverbial syntax`
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https://www.encyclo.co.uk/local/20974

of, pertaining to, or used as an adverb.
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https://www.infoplease.com/dictionary/adverbial
No exact match found.