What does it mean that the displacement difference of uniform velocity linear motion in continuous equal time interval is a constant

What does it mean that the displacement difference of uniform velocity linear motion in continuous equal time interval is a constant

If the static acceleration at the beginning is 1 meter per second square meter, then the velocity after 1 second is 1 m / s, and after 2 seconds is 2 m / s, and the acceleration is constant, so the velocity difference of equal time interval is equal, that is, the product of acceleration and interval time