dissociate

[dih-soh-shee-eyt, -see-]
verb (used with object), dissociated, dissociating.
1.
to sever the association of (oneself); separate: He tried to dissociate himself from the bigotry in his past.
2.
to subject to dissociation.
verb (used without object), dissociated, dissociating.
3.
to withdraw from association.
4.
to undergo dissociation.

Origin:
1605–15; dis-1 + (as)sociate, modeled on Latin dissociātus, past participle of dissociāre to divide, sever

dissociative, adjective

disassociate, dissociate.
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World English Dictionary
dissociate (dɪˈsəʊʃɪˌeɪt, -sɪ-)
 
vb
1.  to break or cause to break the association between (people, organizations, etc)
2.  (tr) to regard or treat as separate or unconnected
3.  to undergo or subject to dissociation
 
dis'sociative
 
adj

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

dissociate
1623, verb use of adj. meaning "separated" (1548), from L. dissociatus, pp. of dissociare "to separate from companionship," from dis- "apart" + sociare "to join," from socius "companion."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Carbonic acid is a weak acid, as you say, meaning it does not dissociate all the way.
The law school scam-busting blogs are right to dissociate themselves from her.
Papain is used to dissociate cells in the first step of cell culture preparations.
If you can't keep your spirits high during a rough patch, then dissociate
  altogether.
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