- Grammar (of a tense) denoting an action completed prior to some past point of time specified or implied, formed in English by had and the past participle, as in he had gone by then【语法】（时态）过去完成时的。
- the pluperfect tense过去完成时。
词源
late 15th cent.: from modern Latin plusperfectum, from Latin （tempus praeteritum） plus quam perfectum '(past tense) more than perfect'.