Webster's English Dictionary

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conspire

con.spire \k*n-'spi-(*)r\ vb [ME conspiren, fr. MF conspirer, fr. L 
   conspirare to breathe]together, agree, conspire, fr. com- + spirare to 
   breathe - more at SPIRIT : PLOT, CONTRIVE  1: to join in a secret agreement 
   to do an unlawful or wrongful act or to u se such means to accomplish a 
   lawful end 2: to act in harmony