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WordNet-Online 
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| Definitions from the WebSingle-trackDefinition:As an adjective, single-track refers to a narrow pathway, road, or railway line that allows passage for only one vehicle or train at a time. It can also describe an activity or event that focuses on a specific subject or group. As a noun, it refers to a railroad or pathway designed for one-way traffic. Examples:Adjective: 
 Noun: 
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| single-replacement reaction single-rotor helicopter single-serving single-shelled single-site single-spaced single-spacing single-stranded single-track single-trip single-user single-vehicle single single bed single breasted jacket single channel single cream 
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