What is the meaning of Pluperfect?

More than perfect, utterly perfect, ideal.

Pertaining to action completed before another action or event in the past, past perfect.

Relating to a certain type of graph, complying with the theorem (pluperfect graph theorem) discovered by D. R. Fulkerson in 1970.

Synonym of multiperfect

Used as an intensifier in various interjections.

The pluperfect tense, the past perfect.

A verb in this tense.

Source: wiktionary.org