Definitions for "Improving"
Tending to improve, beneficial; growing better.
continuing to strengthen a system of rapid entrenchments over time.  A simple rifle trench could be improved by widening the parapet, adding traverses, excavating dug outs or fire pits behind the line, or adding supply caches and a covered way to the rear.  Soldiers tended to work on their entrenchments more or less continuously for as long as they occupied them to make them safer, more comfortable, and more defensible.
Improving Human Research Potential and the Socio-Economic Environment - one of the three Specific Horizontal Programmes of the 5th RTD Framework Programme (1998-2002).
getting higher or more vigorous; "its an up market"; "an improving economy"