the·o·ry:
"from Gk. theoria "contemplation, speculation, a looking at, things looked at," from theorein "to consider, speculate, look at," from theoros "spectator," from thea "a view" + horan "to see." Sense of "principles or methods of a science or art (rather than its practice)" is first recorded 1613. That of "an explanation based on observation and reasoning" is from 1638."
That holds the same way "Chaos" now means "random"
It's roots were retranslated to form our modern use of the word.
BTW, Chaos means "gaping hole"