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addaword.gifdefinition of black swan

noun
an event which has far-reaching consequences, but which no one expected or predicted (because it seemed impossible or because no one had thought of it before)
The Internet was a real black swan - it just came out of nowhere.
Submitted by: Michael from United Kingdom on 04/07/2011 18:24:00
Definition of black swan from the Open Dictionary – a public resource hosted by Macmillan English Dictionary Online

hostile architecture

the design of buildings or public spaces in a way which discourages people from touching, climbing or sitting on them …

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