The term is believed to be a derivation of the phrase Deduced Reckoning.

FORBES: DEDuced Reckoning is Assembling the Mosaic!

By studying these deposits, scientists have deduced that the value of alpha during the ancient nuclear reactions was the same as it is today.

ECONOMIST: Fundamental physics

Margaret Kivelson, of the University of California, Los Angeles, and her colleagues, deduced the existence of Europa's ocean using data collected by Galileo, an American spacecraft that is orbiting Jupiter.

ECONOMIST: Blue moon