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Latin. A Latin phrase that means 'from which' something has come. This term is used with the correlative ad quem (to which) in expressing the computation of time and also that of distance in space. Dies a quo is the day from which. Dies ad quem is the day to which. 

The judge or court from which a cause has been brought by error or appeal, or has otherwise been removed is termed by the judge or court a quo. 

 - Terminus a quo. The point from which distance is reckoned.

 - Court a quo. The ...