concentrations

/K AA0 N S AH0 N T R EY1 SH AH0 N Z/
noun
  1. 1

    The act, process or ability of concentrating; the process of becoming concentrated, or the state of being concentrated.

  2. 2

    A field or course of study on which one focuses, especially as a student in a college or university.

  3. 3

    The proportion of a substance in a whole.

  4. 4

    The matching game pelmanism.

Source: https://en.wiktionary.org/wiki/concentration, https://en.wiktionary.org/wiki/concentrations