engagement vs undertaking

engagement

noun
  • An appointment, especially to speak or perform. 

  • The point at which the fencers are close enough to join blades, or to make an effective attack during an encounter. 

  • Connection or attachment. 

  • The feeling of being compelled, drawn in, connected to what is happening, interested in what will happen next. 

  • The period of time when marriage is planned or promised. 

  • In any situation of conflict, an actual instance of active hostilities. 

undertaking

noun
  • The act of one who undertakes (in either sense). 

  • A promise or pledge; a guarantee. 

  • That which is undertaken; any business, work, or project which a person engages in, or attempts to perform; an enterprise. 

  • The business of an undertaker, or the management of funerals. 

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