inflexion

/IH0 N F L EH1 K SH AH0 N/
noun
  1. 1

    (grammar) A change in the form of a word that reflects a change in grammatical function.

    โ€œan inflection for gender, number, or tenseโ€

  2. 2

    A change in pitch or tone of voice.

  3. 3

    A change in curvature from concave to convex or from convex to concave.

  4. 4

    A turning away from a straight course.

  5. 5

    (optometry) diffraction

Source: https://en.wiktionary.org/wiki/inflection, https://en.wiktionary.org/wiki/inflexion