cons.

/K AH0 N Z/
noun
  1. 1

    That which is permanent or invariable.

  2. 2

    A quantity that remains at a fixed value throughout a given discussion.

  3. 3

    Any property of an experiment, determined numerically, that does not change under given circumstances.

  4. 4

    An identifier that is bound to an invariant value; a fixed value given a name to aid in readability of source code.

Source: https://en.wiktionary.org/wiki/cons., https://en.wiktionary.org/wiki/constant