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.
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   2. The quality of being discreet; wise conduct and
      management; cautious discernment, especially as to matters
      of propriety and self-control; prudence; circumspection;
      wariness.
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            The better part of valor is discretion. --Shak.
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            The greatest parts without discretion may be fatal
            to their owner.                       --Hume.
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   3. Discrimination.
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            Well spoken, with good accent and good discretion.
                                                  --Shak.
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   4. Freedom to act according to one's own judgment;
      unrestrained exercise of choice or will.
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   {At discretion}, without conditions or stipulations.
      [1913 Webster] Discretional