1.Definition: being the same substance throughout
2.Definition: consisting of great mass; containing a great quantity of matter
"Earth is the most massive of the terrestrial planets"
3.Definition: imposing in scale or scope or degree or power
"Massive retaliatory power", "A massive increase in oil prices", "Massive changes"
4.Definition: imposing in size or bulk or solidity
"Massive oak doors", "Moore's massive sculptures"