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Spanish word mundo comes from Proto-Indo-European *mew(ə)-
*mew(ə)- (Proto-Indo-European)
to wash, wet
mundus (Latin)
Clean, pure; neat. Decorated, adorned. Nice, fine, elegant, sophisticated (= κόσμος) the universe, the world, esp. the heavens and the heavenly bodies. (eccl. Lat.) the world as opposed to the church; this world, the realm of sin and death, as opposed to Christ's kingdom of holiness and life. Implement. The inhabitants of the earth, mankind. Toilet ornaments, decorations, dress (of a woman).
mundo (Spanish)
Society. World.