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出典:Wiktionary
From plūs (“more”) + quam (“than”) + perfectum, neuter singular of perfectus (“achieved; finished; perfected”). Literally, "more than finished".
plūsquamperfectum
From tempus praeteritum plūsquamperfectum, "the pluperfect tense" (Literally: "the more-than-finished past tense")
plusquamperfectum