spacefaringnoun [ U ]
uk/ˈspeɪsˌfeə.rɪŋ//-ˌfer.ɪŋ/the activity of travelling in space:
Debris in orbit is a growing hazard to spacefaring.
spacefaring nations
spacefarer
noun [ C ] uk/ˈspeɪsˌfeə.rər//-ˌfer.ɚ/
Astronauts and cosmonauts are sometimes known as spacefarers.