Etymology
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kos (n.)

measure of distance in India (about 2 miles), from Hindi kos, from Sanskrit krosah, literally "a call, a shout;" thus, "distance within which a man's shout can be heard."

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Definitions of kos

kos (n.)
(in India) a unit of length having different values in different localities;
Synonyms: coss
From wordnet.princeton.edu