Agreement between two or more parties to commission and carry out an offense, such as to commit murder or inflict injury, or to defraud, rob, or steal. In many jurisdictions the conspiracy Agreement itself is considered acrime, whether or not the intended offense was carried out. 
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USAGE EXAMPLE

I am beginning to believe my co-workers have some sort of conspiracy planned to sabotage my position, because I discovered files were missing from my desk and someone hacked into my emails.