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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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.
In the actual road network, however, constraints caused by the road network and impedimental buildings are also main factors determining the walking range.