Anatomy, Zoology. a band of tissue, usually white and fibrous, serving to connect bones, hold organs in place, etc.
a tie or bond: The desire for personal freedom is a ligament uniting all peoples.

1375–1425; late Middle English < Medieval Latin ligāmentum, Latin: bandage, equivalent to ligā(re) to tie + -mentum -ment Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ligament (ˈlɪɡəmənt)
1.  anatomy any one of the bands or sheets of tough fibrous connective tissue that restrict movement in joints, connect various bones or cartilages, support muscles, etc
2.  any physical or abstract connection or bond
[C14: from Medieval Latin ligāmentum, from Latin (in the sense: bandage), from ligāre to bind]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1400, from L. ligamentum "band, tie, ligature," from ligare "to bind, tie," from PIE *leig- "to bind" (cf. Alb. lith "I bind," M.L.G. lik "band," M.H.G. geleich "joint, limb").
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

ligament lig·a·ment (lĭg'ə-mənt)

  1. A band or sheet of tough fibrous tissue connecting two or more bones, cartilages, or other structures, or serving as support for fasciae or muscles.

  2. A fold of peritoneum supporting any of the abdominal viscera.

  3. The cordlike remains of a fetal vessel or other structure that has lost its original lumen.

lig'a·men'tal (-měn'tl) or lig'a·men'ta·ry (-měn'tə-rē, -měn'trē) or lig'a·men'tous adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
ligament   (lĭg'ə-mənt)  Pronunciation Key 
A sheet or band of tough fibrous tissue that connects two bones or holds an organ of the body in place.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

ligament definition

A kind of fibrous connective tissue that binds bones or cartilage together.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
He suffered a torn medial collateral ligament and posterior cruciate ligament.
Earlier this year he tore a ligament in his knee which required orthopedic
Knee ligament injuries can strike at any time and be utterly devastating to an
  athlete's career.
Cross, one of the best blocking tight ends in football, slightly tore a
  ligament in his knee during the preseason.
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