idealisation

/AY0 D IY1 L IH0 Z EY1 SH AH0 N/
noun
  1. 1

    The act or process of idealizing.

  2. 2

    The representation of natural objects, scenes, etc., in such a way as to show their most important characteristics; the study of the ideal.

Source: https://en.wiktionary.org/wiki/idealisation, https://en.wiktionary.org/wiki/idealization