Relating to or characteristic of a barrister, which is a British lawyer who specializes in courtroom advocacy and legal representation.
From 'barrister' plus the suffix '-ial' (relating to). Barrister comes from 'bar' referring to the physical barrier in courtrooms separating lawyers from the public, dating to at least the 16th century.
The physical bar in courtrooms literally created the job title 'barrister'—only lawyers standing beyond the bar could directly argue cases, so 'bar-ister' became the person of the bar, shaping legal professions for 500 years!
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