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opposed-cylinder engine
opposite
opposite field
opposite number
opposite prompt
opposite sex
opposition
opposition research
oppositionist
oppress
oppressive
opprobrium
oppugn
ops
opsin
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opsonic index
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opt out
opt out


intransitive verb 
Definition:
 
choose not to do something: to decide not to join in something or not to go along with something ( informal )

Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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