1. variable noun
Someone's environment is all the circumstances, people, things, and events around them that influence their life. ■ EG: ⇒ Pupils in our schools are taught in a safe, secure environment. ⇒ The moral characters of men are formed not by heredity but by environment
2. countable noun
Your environment consists of the particular natural surroundings in which you live or exist, considered in relation to their physical characteristics or weather conditions. ⇒ ...the maintenance of a safe environment for marine mammals.
3. singular noun
The environment is the natural world of land, sea, air, plants, and animals. ⇒ ...persuading people to respect the environment.