locale vs terrain

locale

noun
  • The place where something happens. 

  • The set of settings related to the language and region in which a computer program executes. Examples are language, currency and time formats, character encoding etc. 

  • A partially ordered set with the following additional axiomatic properties: any finite subset of it has a meet, any arbitrary subset of it has a join, and distributivity, which states that a binary meet distributes with respect to an arbitrary join. (Note: locales are just like frames except that the category of locales is opposite to the category of frames.) 

terrain

noun
  • An area of land or the particular features of it. 

  • The surface of the earth; the ground. 

  • A single, distinctive rock formation; an area having a preponderance of a particular rock or group of rocks. 

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