boundary vs parameter

boundary

noun
  • The bounds, confines, or limits between immaterial things (such as one’s comfort zone, privacy, or professional sphere and the realm beyond). 

  • An edge or line marking an edge of the playing field. 

  • The dividing line or location between two areas. 

  • An event whereby the ball is struck and either touches or passes over a boundary (with or without bouncing), usually resulting in an award of 4 (four) or 6 (six) runs respectively for the batting team. 

  • (of a set) The set of points in the closure of a set S, not belonging to the interior of that set. 

parameter

noun
  • A characteristic or feature that distinguishes something from others. 

  • An input variable of a function definition, that gets an actual value (argument) at execution time. 

  • The ratio of the three crystallographic axes which determines the position of any plane. 

  • A variable that describes some system (material, object, event, etc.) or some aspect thereof. 

  • The fundamental axial ratio for a given species. 

  • An actual value given to such a formal parameter. 

  • A variable of a model that is trained by a machine learning algorithm. 

  • A value kept constant during an experiment, equation, calculation, or similar, but varied over other versions of the experiment, equation, calculation, etc. 

  • Any measured quantity of a statistical population that summarises or describes an aspect of the population. 

  • In the ellipse and hyperbola, a third proportional to any diameter and its conjugate, or in the parabola, to any abscissa and the corresponding ordinate. 

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