The best replacement for dilution is dilution factor.

The best alternatives to dilution are rated as following:
★★★★★  dilution factor
★★★  concentration
★★  direct dilution
★★  ratio
★  substitution
★  nitrogen washout
★  double dilution
★  parallel dilution
★  accretion
  dilution
  serial dilution
  anti dilution
  concentration urine
  titration

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Speaking about dilution, one probably shouldn't forget about molarity.

Other search terms related to dilution and their ratings are:
★★★★★ molarity
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dilution
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