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a. Something that impedes; a hindrance or obstruction.
b. Law Something that obstructs the making of a legal contract.
2. A physical defect, especially one that interferes with speech.
[Middle English, from Old French, from Latin impedīmentum, from impedīre, to impede; see impede.]
im·ped′i·men′tal (-mĕn′tl), im·ped′i·men′ta·ry (-mĕn′tə-rē) adj.