spacefaring Syllabification: (space·far·ing)Pronunciation: /ˈspāsˌfe(ə)riNG/Definition of spacefaring noun the action or activity of traveling in space:the complications in spacefaring [as modifier]:spacefaring nations are racing to develop new technologiesDerivatives spacefarerPronunciation: /-rer/ noun spacefaring in other Oxford dictionaries Definition of spacefaring in the British & World English dictionary