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In grammar, an intensifier is a word, usually an adverb, that you add to make another word stronger. In “that is absolutely wonderful,” absolutely is the intensifier. It does not add a new picture; it only turns the volume up. Very, so, really, and extremely work the same way. They can stand before an adjective (“very tired”), before another adverb (“really quickly”), and sometimes before a verb (“I totally agree”). This is a classroom and language-study word; outside school people just use the little word itself. English keeps making new ones, and younger speakers may stretch so or literally in ways older speakers find loose. There is a wider meaning — anything that makes something stronger — but here this is the grammar use.
強調副詞、程度副詞（文法用語：very、so、absolutely 這類把語氣加重的詞）
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
intensifiernoun
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That which intensifies.
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human-scienceslinguisticssciencesA word or particle that heightens the intensity of meaning of a term.
- “Plus-” and “doubleplus-” are both intensifiers that replace words of different extremities, and the words very and extremely respectively. So words like great, excellent and horrible are rendered redundant in Newspeak, replaced by “plusgood”, “doubleplusgood” and “doubleplusungood” respectively. Note how “un-” has to follow the intensifier prefix.
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artshobbieslifestyleA chemical agent used to intensify the lights or shadows of a photograph.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。