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Spanish word reto comes from Latin re-, Latin putare, and later Latin reputo (I count or calculate again. I ponder or reflect.)
re- (Latin)
Again; prefix added to various words to indicate an action being done again, or like the other usages indicated above under English.. Back, backwards.
putare (Latin)
reputo (Latin)
I count or calculate again. I ponder or reflect.
retar (Spanish)
To defy, challenge. To scold, reprimand.
reto (Spanish)
Challenge, dare.