ad valorem 'according to the value', often used in the context of taxes and duties.

• running account credit
• runrig
• sacrilege
• safe system of work
• safety
• sale
• sale and leaseback
• salmon fishing
• salus reipublicae suprema lex
• salvage
• sample (sale by, implied term)
• sanctions
• sasine
• satisfactory quality
• schedule
• Schedule A
• Schedule C
• Schedule D
• Schedule F
• schedule of poinding
• Schengen Agreement
• scienter
• Scottish Administration
• Scottish Conveyancing and Executry Services Board
• Scottish Criminal Cases Review Commission