INERTIA

this is the tendency of a MEST object to remain motionless until acted upon by an exterior force, or to continue in a line of motion until acted upon by an exterior force. (HCOB 5 Dec 73)

a fixed condition without change; disinclination to move or act. —Academy Level I Glossary - Approved November 1990

Every material object continues in its state of rest, or uniform motion in a straight line, unless it is compelled to change that state by forces impresseda tendency to remain in a fixed condition without change; disinclination to move or act.a fixed condition without change; disinclination to move or act.momentum. (physics) the tendency of matter to remain at rest if at rest, or, if moving, to keep moving in the same direction, unless affected by some outside force. (physics) the tendency of matter to stay at rest, or to keep on moving in the same direction, unless acted on by an outside force.