causa sine qua non
See causation.

• persistent vegetative state
• personal Act
• personal allowances
• personal chattel
• personal company
• personal contract
• personal-credit agreement
• Personal Independence Payment
• personal property
• personal protection order
• personal representative
• personal right
• personal service
• personalty
• personal union
• persona non grata
• per stirpes
• persuasive authority
• persuasive burden of proof
• perverse verdict
• perverting the course of justice
• petition
• petition of right
• petroleum revenue tax
• petty patent