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op.
op art
op. cit.
op-ed
op shop
opacify
opacity
opah
opal
opalesce
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opaline
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opaque projector
ope
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open book
o·pen book


noun 
Definition:
 
something or somebody easily comprehensible: somebody or something that is very easy to understand or about which everything is known
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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