Impediment definition: obstruction; hindrance; obstacle.. See examples of IMPEDIMENT used in a sentence. An impediment is something that hinders or obstructs, especially a physical defect or a legal barrier. Learn the meaning, usage and synonyms of impediment from various dictionaries and sources. Definition & Meaning The word “impediment” refers to something that obstructs, delays, or hinders progress. It can be used in various contexts, including physical, mental, and legal obstacles. Definition of impediment noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.