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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.
References in classic literature ?
Be this as it may, he does know much about it, and, in the demolition of impedimental fragments of wall, buttress, and pavement, has seen strange sights.
Too much load being impedimental, instructional design based on cognitive load theory tries to reduce cognitive load as much as possible, which preferably starts with decreasing extraneous cognitive load.