Definition of "betterment"

betterment

noun
countable and uncountable, plural betterments
1. An improvement.
  Quotations
  When BR "back-checked" (BR's term) the financial results of steam replacement across 49 schemes, where DMUs had been substituted on the London Midland Region, only one was now profitable. BR thinking on such substitutions referred to "betterment", not profit or loss.
  2023 March 8, David Clough, “The long road that led to Beeching”, in RAIL, number 978, page 43
2. (law) An improvement to a property that adds to its value.