What does COS mean in Chat?

This page is about the meanings of the acronym/abbreviation/shorthand COS in the Internet field in general and in the Chat terminology in particular.

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What does COS mean?

cosine, cos(noun)
ratio of the adjacent side to the hypotenuse of a right-angled triangle

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"COS." Abbreviations.com. STANDS4 LLC, 2015. Web. 4 Oct. 2015. <http://www.abbreviations.com/term/200339>.