Etymology
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motorway (n.)

"specialized highway for fast motor traffic," 1903, from motor- + way (n.). Earliest uses were hypothetical; the thing became a reality 1930s.

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Definitions of motorway

motorway (n.)
a broad highway designed for high-speed traffic;
Synonyms: expressway / freeway / pike / state highway / superhighway / throughway / thruway
From wordnet.princeton.edu