The Collaborative International Dictionary of English v.0.48:

Utter \Ut"ter\, a. [OE. utter, originally the same word as
   outer. See Out, and cf. Outer, Utmost.]
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   1. Outer. "Thine utter eyen." --Chaucer. [Obs.] "By him a
      shirt and utter mantle laid." --Chapman.
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            As doth an hidden moth
            The inner garment fret, not th' utter touch.
                                                  --Spenser.
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   2. Situated on the outside, or extreme limit; remote from the
      center; outer. [Obs.]
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            Through utter and through middle darkness borne.
                                                  --Milton.
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            The very utter part pf Saint Adelmes point is five
            miles from Sandwich.                  --Holinshed.
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   3. Complete; perfect; total; entire; absolute; as, utter
      ruin; utter darkness.
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            They . . . are utter strangers to all those anxious
            thoughts which disquiet mankind.      --Atterbury.
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   4. Peremptory; unconditional; unqualified; final; as, an
      utter refusal or denial. --Clarendon.
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   Utter bar (Law), the whole body of junior barristers. See
      Outer bar, under 1st Outer. [Eng.]

   Utter barrister (Law), one recently admitted as barrister,
      who is accustomed to plead without, or outside, the bar,
      as distinguished from the benchers, who are sometimes
      permitted to plead within the bar. [Eng.] --Cowell.
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Bouvier's Law Dictionary, Revised 6th Ed (1856):

UTTER BARRISTER, English law, Those barristers who plead without the bar,
and are distinguished from benchers, or those who have been readers and who
are allowed to plead within the bar, as the king's counsel are. The same as
ouster barrister. See Barrister.