- An unexpected natural or man-made catastrophe of substantial extent causing significant physical damage or destruction, loss of life or sometimes permanent change to the natural environment.
- An unforeseen event causing great loss, upset or unpleasantness of whatever kind.
Etymology: From Italian disastro, disaster; originally meaning "unfavourable to one's stars", from dis-Italian, dis-, bad (compare dys-), + astro, star, celestial body, from Latin astrum, from Greek astron.
- The downpour and gales turned the wedding into a .
- (computing) An irreparable loss of data from a database.
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Full Definition of disaster