environment

https://doi.org/10.1351/goldbook.15666
Aggregate, at a given moment, of all external conditions and influences to which a system under study is subjected.
Source:
PAC, 2007, 79, 1153. (Glossary of terms used in toxicology, 2nd edition (IUPAC Recommendations 2007)) on page 1214 [Terms] [Paper]