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From The Collaborative International Dictionary of English v.0.48:
Unavoidable \Un`a*void"a*ble\, a. 1. Not avoidable; incapable of being shunned or prevented; inevitable; necessary; as, unavoidable troubles. [1913 Webster] 2. (Law) Not voidable; incapable of being made null or void. --Blackstone. [1913 Webster] Unavoidable hemorrhage (Med.), hemorrhage produced by the afterbirth, or placenta, being situated over the mouth of the womb so as to require detachment before the child can be born. [1913 Webster] -- Un`a*void"a*ble*ness, n. -- Un`a*void"a*bly, adv. [1913 Webster]