(transitive, sciences) To make dual, to find or consider the dual item of a given one. / (transitive, road transport) To transform into a dual carriageway.

A singer with a deep, strong voice that spans the range between baritone and tenor

The quality or state of being antineoplastic.

(chiefly computing) Designed to be easy for an untrained user to use, with intuitive ordering of steps, consistent and logical placement of controls, etc.