: very good or great : unusual in a way that is very impressive
The book was a phenomenal [=huge] success.
Her performance was phenomenal. [=amazing]
Cite this Entry
“Phenomenal.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/phenomenal. Accessed 15 Apr. 2026.
Copy Citation
