1 Greek Mythology any of the older gods who preceded the Olympians and were the children of Uranus (Heaven) and Gaia (Earth). Led by Cronus, they overthrew Uranus; Cronus' son, Zeus, then rebelled against his father and eventually defeated the Titans.
(as noun, usually a titan
) a person or thing of very great strength, intellect, or importance:a titan of American industry
2 Astronomy the largest satellite of Saturn, the fifteenth closest to the planet, discovered by C. Huygens in 1655, and having a diameter of 3,200 miles (5,150 km). It is unique in having a hazy atmosphere of nitrogen, and methane and other hydrocarbons.