Noun

1. any large portion of the Earth's land area which has a generally uniform climate and soil and therefore a high degree of uniformity in the composition of species; a number of different classifications have been proposed by different people

See also

• Alleghenian
• arctic-alpine
• arid transition
• Austrariparian
• boreal
• Canadian
• Carolinian
• cool temperate
• Hudsonian
• humid transition
• lower Sonoran
• polar
• subpolar
• subtropical
• tropical
• upper Sonoran
• warm temperate