dormiveratis
Dormiveratis is the second-person plural pluperfect active indicative form of the Latin verb dormire, meaning "to sleep." This tense form expresses an action that had been completed prior to another past action or time reference. It is derived from the perfect stem dormiv- and the pluperfect personal ending -eratis, following the regular pattern for fourth-conjugation verbs in the pluperfect tense.
In English, dormiveratis translates as "you had slept." It is primarily found in historical prose, narrative
The form is regular for learners of Latin and illustrates the way the perfect stem is extended
See also: dormire, Latin verb conjugation, pluperfect tense.