1. Designating sound transmission from two sources through two channels
   - stereophonic, stereo

See also: biaural, binaural

• family Accipitridae
• family Aceraceae
• family Acipenseridae
• family Acrididae
• family Actinidiaceae
• family Actinomycetaceae
• family Adelgidae
• family Adiantaceae
• family Aegypiidae
• family Aepyornidae
• family Agamidae
• family Agaricaceae
• family Agavaceae
• family Agonidae
• family Ailuropodidae
• family Aizoaceae
• family Akeridae
• family Alaudidae
• family Albuginaceae
• family Albulidae
• family Alcedinidae
• family Alcidae
• family Aleyrodidae
• family Alismataceae
• family Alliaceae