In a manner relating to or involving space travel and cosmonaut activities; in the way cosmonautics functions.
From cosmonautical + -ly (adverb-forming suffix). This creates an adverbial form that describes how something is done according to cosmonautical principles or practices.
Adding '-ly' to 'cosmonautical' creates an adverb that barely anyone uses, reminding us that English lets us create almost infinite word variations—you could theoretically describe how something happens 'cosmonautically' even if no one has ever said it before.
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