A titan can refer to several things, depending on the context. Here are some possible meanings:

• Greek Mythology: In Greek mythology, the Titans were the pre-Olympian gods. They were the twelve children of the primordial parents Uranus and Gaia, with six male Titans and six female Titans. They were overthrown by Zeus and the Olympians in a ten-year war called "the Titanomachy".

• Gigantic Size or Power: A titan can also refer to something that is gigantic in size or power, such as a titan of industry.

• Importance or Influence: A titan can also refer to a person who is extremely important, powerful, or influential in a certain field. For example, Albert Einstein was a titan in the world of science, and Shakespeare was a titan of literature.

• Astronomy: In astronomy, Titan is one of the moons of Saturn.

In summary, a titan can refer to a pre-Olympian god in Greek mythology, something that is gigantic in size or power, a person who is extremely important or influential, or a moon of Saturn.