What is "at discretion"

Discretion \Dis*cre"tion\, n. [F. discr['e]tion, L. discretio separation, difference, discernment, fr. discernere, discretum. See Discreet, Discern.]

1. Disjunction; separation. [Obs.]
   --Mede.

2. The quality of being discreet; wise conduct and management; cautious discernment, especially as to matters of propriety and self-control; prudence; circumspection; wariness.

   The better part of valor is discretion.
   --Shak.

   The greatest parts without discretion may be fatal to their owner.
   --Hume.

3. Discrimination.

   Well spoken, with good accent and good discretion.
   --Shak.

4. Freedom to act according to one's own judgment; unrestrained exercise of choice or will.

   At discretion, without conditions or stipulations.