As an expert in the field of environmental science, I can provide you with a comprehensive definition of a tropical rainforest. A tropical rainforest is a dense, lush, and highly diverse ecosystem characterized by its warm climate and high annual rainfall. It is typically found near the equator, where sunlight is abundant throughout the year, and it plays a crucial role in the global climate, biodiversity, and the carbon cycle.

Structure and Composition
Tropical rainforests are composed of several layers, each with distinct flora and fauna. The canopy layer, which is the topmost layer, is dominated by tall, broad-leaved evergreen trees that can reach heights of over 30 meters. This layer receives the most sunlight and is home to a variety of plant and animal species. Beneath the canopy is the understory, which is a transitional zone with shorter trees and shrubs. The forest floor, the lowest layer, receives little sunlight and is composed of decomposing plant matter, fungi, and a limited number of shade-tolerant plant species.

Climate
The climate in tropical rainforests is characterized by high temperatures and humidity, with average temperatures ranging from 18 to 34 degrees Celsius (64 to 93 degrees Fahrenheit). Rainfall is also abundant, with annual precipitation typically exceeding 2000 millimeters (about 80 inches). This high level of rainfall ensures that the forest remains moist and fertile throughout the year.

Biodiversity
Tropical rainforests are renowned for their incredible biodiversity. They are home to more than half of the world's plant and animal species, including many that are found nowhere else on Earth. The dense vegetation provides a multitude of habitats for a wide range of organisms, from the tiniest insects to large mammals such as elephants, tigers, and orangutans.

Ecosystem Services
Tropical rainforests provide a multitude of ecosystem services that are vital to the health of our planet. They are major contributors to the global oxygen supply, as they absorb large amounts of carbon dioxide and release oxygen through the process of photosynthesis. They also play a critical role in water regulation, as they help to maintain the water cycle by absorbing and releasing water vapor. Additionally, tropical rainforests are important for soil conservation and nutrient recycling.

Threats and Conservation
Despite their importance, tropical rainforests are under threat from various human activities, including deforestation, agriculture, and urban development. These activities lead to habitat loss and fragmentation, which can have devastating effects on the biodiversity and ecosystem services that these forests provide. Conservation efforts are essential to protect and preserve these valuable ecosystems for future generations.

In conclusion, tropical rainforests are complex and vital ecosystems that support a vast array of life on our planet. They are characterized by their warm climate, high rainfall, and incredible biodiversity. Understanding and protecting these ecosystems is crucial for maintaining the health of our planet and the countless species that depend on them.

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Definition of rain forest. 1 : a tropical woodland with an annual rainfall of at least 100 inches (254 centimeters) and marked by lofty broad-leaved evergreen trees forming a continuous canopy -- called also tropical rain forest. 2 : temperate rain forest.read more >>