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nova

nova /ˈnoʊvə/ noun
plural novas or novae /ˈnoʊvi/
nova
/ˈnoʊvə/
noun
plural novas or novae /ˈnoʊvi/
Britannica Dictionary definition of NOVA
[count] astronomy
: a star that suddenly increases greatly in brightness and then within a few months or years becomes less bright again see also supernova