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unbound

[uhn-bound] /ʌnˈbaʊnd/
verb
1.
simple past tense and past participle of unbind.
adjective
2.
not bound, as a book.
3.
free; not attached, as by a chemical bond:
unbound electrons.
Origin
900
before 900; (adj.) Middle English unbounde, unbunden, Old English unbunden; see un-1, bound1
Can be confused
unbound, unbounded.

unbind

[uhn-bahynd] /ʌnˈbaɪnd/
verb (used with object), unbound, unbinding.
1.
to release from bonds or restraint, as a prisoner; free.
2.
to unfasten or loose, as a bond or tie.
Origin
before 950; Middle English unbinden, Old English unbindan; cognate with German entbinden. See un-2, bind
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un bound

unbind

/ʌnˈbaɪnd/
verb (transitive) -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/
verb
1.
the past tense and past participle of unbind
adjective
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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for un bound
unbind
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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