C1[Toften passive]to control or influence something directly, or to decide what will happen: The number of staff we can take on will be determined by how much money we're allowed to spend.Your health is determined in part by what you eat.Eye colour is genetically determined.[+ question word]formalA pitch inspection will determine whether or not the match will be played.People should be allowed to determine their own future.Decisions and deciding›[T]formalto make a strong decision: [+ that]She determined that one day she would be an actor.[+ to infinitive]On leaving jail, Joe determined to reform.Decisions and deciding