syn ‧ er ‧ gy /ˈsɪnədʒi $ -ər-/ BrE AmE noun [uncountable]
[ Date: 1600-1700 ; Language: Modern Latin ; Origin: synergia , from Greek synergos 'working together' , from syn- ( ⇨ ↑ syn- ) + ergon 'work' ]
technical the additional effectiveness when two or more companies or people combine and work together