A sub-orbital spaceflight is a spaceflight in which the spacecraft reaches outer space, but its trajectory intersects the atmosphere or surface of the gravitating body from which it was launched, so that it will not complete one orbital revolution (it does not become an artificial satellite) or reach escape velocity.

Is suborbital in space?

A suborbital rocket requires just about enough speed to be able to fly to about 100km above Earth's surface. ... But scientists say that at the highest point of a suborbital flight one can experience weightlessness although the vessel itself is not floating in space but is in the process of dropping back to Earth.

What constitutes suborbital?

1 : situated beneath the eye or the orbit of the eye. 2 : being or involving less than one orbit (as of the earth or moon) also : intended for suborbital flight.