If the axes are time/distance then, and only then, it means a constant velocity
If not, then this Q doesn't have enough data to A
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It means that the object in question is moving at a constant speed.If the graph is a straight horizontal line, then the speed is zero.
A straight line graph (on the cartesian or coordinate plane).
Constant speed. Zero acceleration.
BecAuse that would mean it is going an infinite speed. The slope of a distance time graph is the objects velocity or speed. If there is a line parallel to the distance axis, there is a vertical line. The slope of a vertical line is infinite. It is not possible to go an infinite speed.
This means your velocity is decreasing with time, or in other words, the object is slowing down.