WordReference Random House Learner's Dictionary of American English © 2017
space•walk /ˈspeɪsˌwɔk/USA pronunciation   n. [countable]
  1. Aerospacethe act of maneuvering oneself in space outside a spacecraft.

v. [no object]
  1. Aerospaceto do a spacewalk.

WordReference Random House Unabridged Dictionary of American English © 2017
space•walk  (spāswôk′),USA pronunciation n. 
  1. Aerospacea task or mission performed by an astronaut outside a spacecraft in space.

  1. Aerospaceto execute such a task or mission.
[1960–65, Amer.;
space + walk]
spacewalk′er, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

spacewalk /ˈspeɪsˌwɔːk/ n
  1. the act or an instance of floating and manoeuvring in space, outside but attached by a lifeline to a spacecraft
    Technical name: extravehicular activity
  1. (intransitive) to float and manoeuvre in space while outside but attached to a spacecraft

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