Definition - (Aka past perfect)

An aspect used to convey the idea that a past event has been completed prior to another past event, e.g. I had finished my letter before he arrived.

Etymology -
The word was coined by shortening the Latin phrase tempus praeteritum plus quam perfectum, past tense more than perfect.
Note: The Latin phrase itself was coined by translating the Greek phrase khronos hypersyntelikos.

Oxford English Dictionary -
It first citation is from 1530:
"The Preter Pluperfit Tens. Jauóye parlé, I had spoken."
(Jehan Palsgrave, Lesclarcissement de la langue françoyse, 88 )

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