Decrease in Power or Strength
Puzzle 9 of Agatha Christie Medium Pack
Question is: Decrease in Power or Strength
and the answer is: ABATEMENT
Word Meaning:
ABATEMENT — The act of abating, or the state of being abated; a lessening, diminution, or reduction; a moderation; removal or putting an end to; the suppression.
Definitions from Wiktionary.