Calamity n. : Any great misfortune or cause of misery; -- generally applied to events or disasters which produce extensive evil, either to communities or individuals.

Calamity n. : A state or time of distress or misfortune; misery.

Example:
What is the difference between misfortune and Calamity?

Taxonomy
calamity, Merriam-Webster Online Dictionary, Calamity Jane, Dictionary, webster, lam, Latin, Word Games, Webster Online Dictionary with audio pronunciations, Middle English, distress, loss, glossary, language, ESL, ty, Inflected, ties.

Defination from the web:
calamity from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 2 : a disastrous event marked by great loss and lasting distress and suffering <calamities of nature> <an economic calamity> ...