in ‧ ter ‧ ven ‧ tion W3 AC /ˌɪntəˈvenʃ ə n $ -tər-/ BrE AmE noun [uncountable and countable]
[ Word Family: verb : ↑ intervene ; noun : ↑ intervention ]
the act of becoming involved in an argument, fight, or other difficult situation in order to change what happens:
government intervention to regulate prices