a person who is very important, powerful, strong, big, clever, etc.

an intellectual titan 学界泰斗

The final will be a clash of the (= a hard struggle and competition between) titans. 决赛将会是一场龙虎斗。

The soft drink titans (= big companies who produce these drinks) are struggling for control of the market. 软饮料巨擘正在争夺市场的控制权。