Phenomenal means extremely unusual, outstanding, or remarkable. It can also refer to something that is a phenomenon or can be perceived by the senses. See synonyms, examples, and pronunciation of phenomenal. Phenomenal definition: highly extraordinary or prodigious; exceptional.. See examples of PHENOMENAL used in a sentence. Definition of phenomenal in the Definitions.net dictionary. Meaning of phenomenal. What does phenomenal mean? Information and translations of phenomenal in the most comprehensive dictionary definitions resource on the web. 'Phenomenal' means very remarkable or extraordinary, perceptible by the senses or through immediate experience.