fu ‧ sion /ˈfjuːʒ ə n/ BrE AmE noun [uncountable and countable]
[ Date: 1500-1600 ; Language: Latin ; Origin: fusio , from fundere 'to pour, melt' ]
1 . a combination of separate qualities or ideas:
Her work is a fusion of several different styles.
the best fusion cuisine in the whole of Vancouver
2 . a physical combination of separate things ⇨ fission :
the energy that comes from the fusion of hydrogen atoms
⇨ ↑ nuclear fusion
3 . a type of music which mixes ↑ jazz with other types of music, especially ↑ rock
⇨ ↑ fuse 2