1. Outside a building
   - outside, outdoors, alfresco

1. Where the air is unconfined
   - outdoors, open air, open

Type of: exterior, outside

• genus Acalypha
• genus Acanthisitta
• genus Acanthocereus
• genus Acanthocybium
• genus Acanthophis
• genus Acanthoscelides
• genus Acanthurus
• genus Acanthus
• genus Acarus
• genus Accipiter
• genus Acer
• genus Acherontia
• genus Acheta
• genus Achillea
• genus Achimenes
• genus Achoerodus
• genus Achras
• genus Acinonyx
• genus Acinos
• genus Acipenser
• genus Acocanthera
• genus Acokanthera
• genus Aconitum
• genus Acorus
• genus Acridotheres