pluperfect Grammar
■ adjective (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.
■ noun a verb in the pluperfect tense.
Origin
C15: from mod. L. plusperfectum , from L. (tempus praeteritum) plus quam perfectum '(past tense) more than perfect'.