From http://www.cat41.org/Defs/Quia.htm:

The word 'quia' is simply Latin for 'because'. A quia subscription to the Lutheran Confessions indicates that one holds to their teaching because it is in full agreement with Holy Scripture. This is in contrast to a 'quatenus subscription', 'quatenus' being Latin for 'insofar as'--that is, "I hold to the Lutheran Confessions 'insofar as (I see them to) agree with Scripture."

Bingley

Bingley