I began learning about acceleration and according to the source i learned from an object only accelerates when there is change in vel. &/ direction... what i am wondering is what do you call it when the object does not accelerate? i.e. when the object travels at a constant speed and direction.
I don't think you call the object anything. You might hear people use the phrase "uniform motion". Although this term can also be applied to circular motion as "uniform circular motion" which is motion in a circle with a constant speed, but like you said there is still acceleration due to a direction change.
So I would say "uniform motion", "uniform linear motion", "motion under $0$ acceleration", or maybe just "constant velocity". Maybe other people know some things I haven't heard of or thought of though.
It should be mentioned that this all depends on the reference frame you are observing the object in. All motion is relative, so you need to first specify your frame of reference. For example, a ball in free fall will appear at rest to someone falling along with the ball, but to an observer on the Earth the motion of the ball will not be uniform linear motion. Since you made minimal assumptions, I just stuck with a simple answer. If the object is observed from an inertial (non-accelerating) frame, then we will see uniform linear motion in all inertail frames.
that's what i would call it.