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cosmonautics

[koz-muh-naw-tiks, -not-iks]
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noun (used with a singular verb)
  1. astronautics, especially as applied to space flight.

Origin of cosmonautics

First recorded in 1945–50; see origin at cosmonaut, -ics
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018