portage vs transmission

portage

noun
  • A porthole. 

  • An act of carrying, especially the carrying of a boat overland between two waterways. 

  • The route used for such carrying. 

  • The wages paid to a sailor when in port, or for a voyage. 

  • A charge made for carrying something. 

  • Carrying capacity; tonnage. 

verb
  • To carry a boat overland 

transmission

noun
  • The fact of being transmitted. 

  • An assembly of gears through which power is transmitted from the engine to the driveshaft in a motor car / automobile; a gearbox. 

  • Something that is transmitted, such as a message, picture, or a disease; the sending of such a thing. 

  • The passage of a nerve impulse across synapses. 

  • The passing of a communicable disease from an infected host individual or group to a conspecific individual or group. 

  • The right possessed by an heir or legatee of transmitting to his successor(s) any inheritance, legacy, right, or privilege, to which he is entitled, even if he should die without enjoying or exercising it. 

  • The act of transmitting, e.g. data or electric power. 

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