Definition of duty:

part of speech: noun

The obedience which one owes to another, as to a parent or superior; that which a person is bound to pay, do, or perform; tax, impost, or toll; service; business.

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The loadstone, which has the property of attracting iron, and of pointing to the poles when freely suspended; a bar of steel, to which the properties of the loadstone are imparted by contact; any piece of iron rendered powerfully attractive by a galvanic current; any powerful attraction. ...