https://doi.org/10.1351/goldbook.S06153
A system of two or more @M03986@ held together and organized by means of @I03098@ (noncovalent) binding interactions.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1169 [Terms] [Paper]