As against something
Definition 1 of 1
Pro Tip 1/3Contrast Emphasis
Use 'as against' to stress differences or changes when comparing situations, objects, or time periods. 
The team won only four games this season, as against twelve last year.
Pro Tip 2/3Not Interchangeable
'As against' is not interchangeable with 'against' alone, which often implies opposition or resistance. 
He chose traditional methods as against the modern ones recommended.
Pro Tip 3/3Comparative Context
Use 'as against' in contexts where two distinct alternatives or options are being weighed or evaluated. 
She has thirty votes, as against his twenty.