before 900; (adj.) Middle English unbounde, unbunden, Old English unbunden; see un-1, bound1

unbound, unbounded.
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verb (used with object), unbound, unbinding.
to release from bonds or restraint, as a prisoner; free.
to unfasten or loose, as a bond or tie.

before 950; Middle English unbinden, Old English unbindan; cognate with German entbinden. See un-2, bind

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
unbind (ʌnˈbaɪnd)
vb , -binds, -binding, -bound
1.  to set free from restraining bonds or chains; release
2.  to unfasten or make loose (a bond, tie, etc)

unbound (ʌnˈbaʊnd)
1.  the past tense and past participle of unbind
2.  (of a book) not bound within a cover
3.  not restrained or tied down by bonds
4.  (of a morpheme) able to form a word by itself; free

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

O.E. unbindan, "to free from binding," from un- (2) + bind. Cf. Ger. entbinden, Du. ontbinden. Lit. and fig. senses both present in O.E.
"Suæ huæt ðu unbindes ofer eorðu bið unbunden in heofnum." [Lindisfarne Gospels, Matt. XVI.19]
Unbound is from O.E. unbunden, in literal sense. Figurative sense first attested late 14c.; of books from 1540s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The wind blew her garments, and her unbound hair streamed loose behind her.
First, with a few temporary exceptions, it converted all non-tariff barriers and unbound tariffs into bound tariffs.
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