accession vs augmentation

accession

noun
  • A coming to; the act of acceding and becoming joined. 

  • A mode of acquiring property, by which the owner of a corporeal substance which receives an addition by growth, or by labor, has a right to the part or thing added, or the improvement (provided the thing is not changed into a different species). 

  • The act of coming to or reaching a throne, an office, or dignity. 

  • The invasion, approach, or commencement of a disease; a fit or paroxysm. 

  • Access; admittance. 

  • A group of plants of the same species collected at a single location, often held in genebanks. 

  • Complicity, concurrence or assent in some action. 

  • Agreement. 

  • The act by which one power becomes party to engagements already in force between other powers. 

  • Increase by something added; that which is added; augmentation from without. 

verb
  • To make a record of (additions to a collection). 

augmentation

noun
  • The act or process of augmenting. 

  • A surgical procedure to enlarge a body part, as breast augmentation. 

  • A particular mark of honour, granted by the sovereign in consideration of some noble action, or by favour; and either quartered with the family arms, or on an escutcheon or canton. 

  • The stage of a disease during which symptoms increase or continue. 

  • A compositional technique where the composer lengthens the melody by lengthening its note values. 

  • An increase of stipend obtained by a parish minister by an action raised in the Court of Teinds against the titular and heritors. 

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