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In grammar, the pluperfect is the form that means “had done” — She had left before I called. English already had a “perfect” (have done). The pluperfect sits one step further back in time: the thing was already finished before another past moment. English teachers in Taiwan almost always call this the past perfect, not the pluperfect. Pluperfect is the older, Latin-classroom name. You will still see it in some grammar books, especially older ones, and in talk about other languages that keep this name for a tense. Though actually, a few people play with pluperfect to mean “extremely perfect,” but that is a joke with the pieces of the word. The real job of the word is the tense.
過去完成式（台灣課本多寫 past perfect；這是較舊的叫法）
組成A shortening of plusquamperfect, from Latin plusquamperfectum: plus (“more”) + quam (“than”) + perfectum (“finished,” also the name of the perfect tense). The name means “more than perfect.”
原始詞典資料7 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。
pluperfectadj/pluːˈpɜː.fɪkt/
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More than perfect, utterly perfect, ideal.
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grammarhuman-scienceslinguisticsPertaining to action completed before another action or event in the past, past perfect.
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graph-theorymathematicssciencesBeing or relating to a certain type of graph that complies with a theorem ("pluperfect graph theorem") discovered by D. R. Fulkerson in 1970, satisfying even more constraints than a perfect graph.
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mathematicssciencesSynonym of multiperfect.
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informalUsed as an intensifier in various interjections.
- What in the pluperfect hell is going on here?!
- The drought has raised pluperfect heck with fishing more ways than one.
pluperfectnoun/pluːˈpɜː.fɪkt/
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The pluperfect tense, the past perfect.
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A verb in this tense.
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。