in rem 'against a thing' (as opposed to against a person).

• first instance
• First Lord of the Treasury
• First Minister
• first reading
• First Secretary
• fisheries policy
• fishing
• fitness for purpose, implied term
• fixed charge
• fixed penalty notice
• fixed security
• fixed sum credit
• fixtures
• flagrante delicto
• floating charge
• floodgates
• flotsam
• flying picket
• f.o.b.
• f.o.r.
• forbidden degrees
• force and fear
• force majeure
• foreclosure
• foreign bill