partial agonist

https://doi.org/10.1351/goldbook.14174
Agonist that is unable to induce a maximal receptor response in a given biological assay, regardless of the amount applied.
See also: efficacy
Source:
PAC, 2011, 83, 1129. (Glossary of terms used in biomolecular screening (IUPAC Recommendations 2011)) on page 1150 [Terms] [Paper]