1) Kind of carriage 
• (a.) Being without a horse; specif., not requiring a horse; -- said of certain vehicles in which horse power has been replaced by electricity, steam, etc.; as, a horseless carriage or truck.
Horse'less adjective Being without a horse; specif., not requiring a horse; -- said of certain vehicles in which horse power has been replaced by electricity, steam, etc.; as, a horseless carriage or truck.