Noun
an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point
Source: WordNetIt had long been an ambition to find the line of force that might lead to the Holy Land in the time of Christ. Stephen R. Lawhead
These dimensions impinge on one another. They touch. They interpenetrate. And where one dimension touches or passes through another, it forms a line of force on the landscape. Stephen R. Lawhead
To escape from a rear arm lock, straighten the arm by choosing the best line of force. The hand turns and goes in an upward direction. Then step in and unbalance the opponent. Wong Shun Leung