Eccentric can mean deviating from a circular form or path, or being odd or unconventional. Learn the origin, synonyms, antonyms, and usage of eccentric in different contexts. Eccentric individuals may display unusual habits, dress in unconventional ways, or hold unconventional beliefs that set them apart from the mainstream. This term can also be applied to objects or designs that are unconventional or strikingly different from the norm. Eccentric definition: deviating from the recognized or customary character, practice, etc.; irregular; erratic; peculiar; odd.. See examples of ECCENTRIC used in a sentence. What does the word eccentric mean ? There are 18 meanings listed in OED's entry for the word eccentric , four of which are labelled obsolete. See ‘ Meaning & use’ for definitions, usage, and quotation evidence. eccentric