The enumeration date is as you surmised the actual date the info was recorded. The official enumeration date was 1 June 1850, all questions were to refer to that date. So she probably died sometime between 1 June and Sept 11. Don.
Definition of plague. 1  an annoyance; those children are a damn plague. 2  any large scale calamity (especially when thought to be sent by God) 3  a swarm of insects that attack plants; a plague of grasshoppers. 4  any epidemic disease with a high death rate.
Wiktionary(4.20 / 5 votes)Rate this definition: 1  plague(Noun) (used absolutely, usually capitalized: The Pest) The pestilent disease Plague, caused by the virulent bacterium Yersinia pestis and mostly known by its variant form bubonic plague. 2  plague(Noun) An epidemic or pandemic caused by any pestilence, but specifically by the above disease.