Wiktionary
n. any activity done by an astronaut outside of a spacecraft etc; a spacewalk or moonwalk
Wikipedia
Extravehicular activity (EVA) is any activity done by an astronaut or cosmonaut outside a spacecraft beyond the Earth's appreciable atmosphere. The term most commonly applies to a spacewalk made outside a craft orbiting Earth (such as the International Space Station), but also has applied to lunar surface exploration (commonly known as moonwalks) performed by six pairs of American astronauts in the Apollo program from 1969 to 1972. On each of the last three of these missions, astronauts also performed deep-space EVAs on the return to Earth, to retrieve film canisters from the outside of the spacecraft. Astronauts also used EVA in 1973 to repair launch damage to Skylab, the United States' first space station.
A "Stand-up" EVA (SEVA) is where the astronaut does not fully leave a spacecraft, but is completely reliant on the spacesuit for environmental support. Its name derives from the astronaut "standing up" in the open hatch, usually to record or assist a spacewalking astronaut.
EVAs may be either tethered (the astronaut is connected to the spacecraft; oxygen and electrical power can be supplied through an umbilical cable; no propulsion is needed to return to the spacecraft), or untethered. Untethered spacewalks were only performed on three missions in 1984 using the Manned Maneuvering Unit (MMU), and on a flight test in 1994 of the Simplified Aid For EVA Rescue (SAFER), a safety device worn on tethered U.S. EVAs.
The Soviet Union/Russia, the United States, and China have conducted EVAs.
Usage examples of "extravehicular activity".
Take things easy - never move quickly - stop and think - these were the rules for extravehicular activity.
But your extravehicular activity should have been discussed beforehand.
And this was a NASA extravehicular activity, on the surface of an alien world.
Most of these repairs could not be effected in deep space or even in low orbit without the constant threat of enemy sneak attacks and the overwhelming logistical problems that extended extravehicular activity would entail.
Once Zephram was completely constructed and brought online, Tabitha and I would use our SAFER MMUs (Simplified Aid for Extravehicular activity Rescue Manned Maneuvering Units) to fly back to a safe distance where the Shuttle could catch us.
However, the threesome did discover that one of the extravehicular activity (EVA) pods was missing.
I see that extravehicular activity for final check of external instruments is optional.
This berserker was wearing a temporary harness fitted with small jets, allowing free extravehicular activity.