quod nullius est fit domini regis 'anything that has no ownership falls to the Crown.'

• ad valorem
• advance
• advance corporation tax
• advance directive
• advance freight
• advancement
• advisement
• Advisory Conciliation and Arbitration Service (ACAS)
• advisory opinion
• ad vitam aut culpam
• advocate
• advocate depute
• Advocate-General
• Advocate General for Scotland
• aemulationem vicini
• aequitas
• affiant
• affidavit
• affinity
• affray
• affreightment
• aforethought
• agency
• agent
• age of majority