geo·​space ˌjē-ō-ˈspās How to pronounce geospace (audio)
: the combined area of the earth's upper atmosphere and nearby outer space
The term geospace was coined recently to describe the ensemble of separate regions close to the Earth and traditionally called the atmosphere, ionosphere, magnetosphere, … and solar wind.M. J. Rycroft et al.
The geospace environment is controlled largely by events on the Sun, such as solar flares and coronal mass ejections, which generate significant geomagnetic and upper atmospheric disturbances.N. A. Gross et al.

Examples of geospace in a Sentence

Recent Examples on the Web For 57 years, the telescope at the Arecibo Observatory has served as a world-class resource for radio astronomy, planetary, solar system and geospace research, and the search for extraterrestrial life, according to an NSF statement. Doyle Rice, USA TODAY, 20 Nov. 2020 Moore told the Orlando Sentinel on Wednesday that Maxar, a geospace company that provides satellite images to Google Earth, had responded and offered to help. Lina Ruiz,, 16 Oct. 2020

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'geospace.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


geo- + space entry 1

First Known Use

1961, in the meaning defined above

Time Traveler
The first known use of geospace was in 1961

Dictionary Entries Near geospace

Cite this Entry

“Geospace.” Dictionary, Merriam-Webster, Accessed 24 Feb. 2024.

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