abbreviation vs dissertation

abbreviation

noun
  • A shortened or contracted form of a word or phrase, used to represent the whole, utilizing omission of letters, and sometimes substitution of letters, or duplication of initial letters to signify plurality, including signs such as +, =, @. 

  • The process of abbreviating. 

  • Reduction to lower terms, as a fraction. 

  • Any convenient short form used as a substitution for an understood or inferred whole. 

  • Loss during evolution of the final stages of the ancestral ontogenetic pattern. 

  • One or more dashes through the stem of a note, dividing it respectively into quavers, semiquavers, demisemiquavers, or hemidemisemiquavers. 

  • The result of shortening or reducing; abridgment. 

  • A notation used in music score to denote a direction, as pp or mf. 

dissertation

noun
  • A lengthy lecture on a subject; a treatise; a discourse; a sermon. 

  • A formal exposition of a subject, especially a research paper that students write in order to complete the requirements for a doctoral degree in the US and a non-doctoral degree in the UK; a thesis. 

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