abatement vs concentration

abatement

noun
  • 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. 

  • The reduction of the proceeds of a will, when the debts have not yet been satisfied; the reduction of taxes due. 

  • The action of a person that abates, or without proper authority enters a residence after the death of the owner and before the heir takes possession. 

  • An amount abated; that which is taken away by way of reduction; deduction; decrease; a rebate or discount allowed; in particular from a tax. 

  • Waste of stuff in preparing to size. 

  • A mark of dishonor on an escutcheon; any figure added to the coat of arms tending to lower the dignity or station of the bearer. 

concentration

noun
  • The act, process or product of reducing the volume of a liquid, as by evaporation. 

  • The proportion of a substance in a whole. 

  • The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water. 

  • The direction of attention to a specific object. 

  • A field or course of study on which one focuses, especially as a student in a college or university. 

  • The amount of solute in a solution measured in suitable units (e.g., parts per million (ppm)) 

  • The matching game pelmanism. 

How often have the words abatement and concentration occurred in a corpus of books? (source: Google Ngram Viewer )