In grammar, pluperfect is the verb tense that you use to talk about something that was finished or completed in the past. "They had eaten at five" uses the pluperfect.

Use pluperfect as a noun or an adjective to describe the tense you use to talk about something that didn't just occur in the past, but before the time that you're considering. This is also sometimes called the past perfect. The word pluperfect comes from the Latin phrase plus quam perfectum, "more than perfect." The Latin perfect tense refers to the past, while the pluperfect references "more than past."

Definitions of pluperfect
  1. noun
    a perfective tense used to express action completed in the past
    synonyms: past perfect, past perfect tense, pluperfect tense
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    type of:
    perfect, perfect tense, perfective, perfective tense
    a tense of verbs used in describing action that has been completed (sometimes regarded as perfective aspect)
  2. adjective
    more than perfect
    “he spoke with pluperfect precision”
    being complete of its kind and without defect or blemish
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