The root of the word duty is the Latin verb "debere" - "to owe", or "to have to".

BBC: UK

Each of these distinctions is expressed simply as a conjugation of the root word for vision.

NEWYORKER: Utopian for Beginners

It is the description and the root and the parsing of the word izzle.

NPR: Encyclopedia Surveys World of Hip Hop

If OJ made one thing perfectly clear, it's that the word "reason, " at the root of "reasonable doubt" has lost all meaning in the US court system.

ENGADGET: US lawsuit calls Large Hadron Collider a Doomsday Machine, Higgs boson shrugs