Definition
A witness whose testimony is significantly important to a case, important enough that courts might hold them in custody to ensure they appear at trial.
Example Usage
The key witness was detained as a material witness to ensure his appearance at trial.
Origin
From 'material' meaning 'relevant' or 'important'
Fun Fact
Material witnesses can literally be jailed to prevent them from fleeing, which is one of the few non-criminal uses of pre-trial detention.
Source: Criminal procedure rules and witness protection standards
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