FLOW
  1. an impulse or direction of energy particles or thought or masses between terminals. (HCOB 3 Feb 69)
  2. the progress of particles or impulses or waves from point A to point B. Flow has the connotation of being somewhat directional. (SH Spec 84, 6612C13)
  3. a progress of energy between two points. The points may have masses. The points are fixed and the fixedness of the points and their opposition produce the phenomena of flows. (HCOB 1 Feb 62)
  4. a change of position of particles in space. (PDC 30)
  5. any line of flow, whether contracting or lengthening, is called a flow. A common manifestation is seen in an electric light wire. (Scn 8-80, p. 43)

Technical Dictionary