cert.

/S ER1 T/
adjective
  1. 1

    Abbreviation of certified.

noun
  1. 1

    The state of being certain.

  2. 2

    An instance of being certain.

  3. 3

    A fact or truth unquestionably established.

noun
  1. 1

    A grant of the right of an appeal to be heard by an appellate court where that court has discretion to choose which appeals it will hear.

  2. 2

    A grant of review of a government action by a court with discretion to make such a review.

Source: https://en.wiktionary.org/wiki/cert., https://en.wiktionary.org/wiki/certainty, https://en.wiktionary.org/wiki/certiorari