CMOS ICs Characteristic Query
It simply means that in CMOS technology you can fit more (much more) components on a chip of a certain size than you can in TTL technology.

To illustrate this: the chips inside your smartphone are almost exclusively build in CMOS technology. If these were build using TTL technology your smartphone would be the size of a refrigerator and you would also need a battery the size of a car battery to power it.