Is It Possible to Defend against Hypersonic Missiles?

It is, of course, sloppy terminology to use “hypersonic missile” to denote a missile which maneuvers within the atmosphere, as any ballistic missile that goes faster than Mach 5 is, by definition, a hypersonic weapon. But that’s the terminology we’re stuck with, and that’s what the pundits are calling weapons such as the Russian Avangard and Chinese DF-ZF glide vehicles.