This means, simple race.

I think , this is better.

डॉ. हरदेव बाहरी के शब्दकोश में flat race के लिए एक पर्याय मिला है समतल मैदान पर दौड़ जिसे बाधा दौड़ के विपरीत बताया गया है. इस अर्थ में इसे संक्षिप्त रूप में समतल दौड़ या मैदानी घुड़दौड़ कहा जा सकता है.
विकिपीडिया में इसका अर्थ इस प्रकार दिया गया है:
Flat racing is a term commonly used to denote a form of horse racing which is run over a level track at a predetermined distance. It differs from steeplechase racing over hurdles. The race is a test of speed, stamina and the skill of the jockey in determining by when he/she choses to hold the horse back or to make the horse work harder.

The flat races in Great Britain are run over a variety of distances from five furlongs (1006 m) to over two miles (3219 m) and are generally called sprints, middle distance or stayers races.

Racing takes place on a natural grass surface (turf) or on a synthetic surface (all-weather). Racing in Europe is generally on turf, while in the United States and Canada, the more important races are on dirt or all-weather. Indeed, nearly all North American races are flat races, as steeplechase racing is very infrequent and largely confined to short, specialized race meets. There, the term "flat racing" is rarely used, as the form is so predominant.