1. With the involvement of two parties or governments
   "they worked out an agreement bilaterally" 
2. So as to involve two sides or parts

See also: bilateral

• area of cardiac dullness
• area unit
• areal
• areaway
• areca
• Areca catechu
• areca nut
• Arecaceae
• Arecidae
• areflexia
• aren't
• arena
• arena theater
• arenaceous
• arenaceous rock
• Arenaria
• Arenaria caroliniana
• Arenaria groenlandica
• Arenaria interpres
• Arenaria peploides
• Arenaria serpyllifolia
• Arenaria stricta
• Arenaria-Melanocephala
• Arenaviridae
• arenavirus