fundaments

/F AH0 N D AH0 M EH1 N T S/
noun
  1. 1

    Foundation.

  2. 2

    The bottom; the buttocks or anus.

  3. 3

    The underlying basis or principle for a theoretical or mathematical system.

Source: https://en.wiktionary.org/wiki/fundament, https://en.wiktionary.org/wiki/fundaments