1. A portion of a track, road, or path that is linear and unbent
The racing car accelerated on the straight section of the track.
O carro de corrida acelerou na seção reta da pista.
2. In geometry, a part of a line or curve that does not bend or curve
The engineer measured the straight section of the pipe.
O engenheiro mediu a seção reta do tubo.
3. In railways, a portion of track without curves or slopes
Trains can reach maximum speed on the straight section.
Os trens podem atingir velocidade máxima na seção reta.