a secret plan or agreement to carry out an illegal or harmful act, esp with political motivation; plot
2.
the act of making such plans in secret
conspiration in American English
(ˌkɑnspəˈreiʃən)
noun
1.
joint effort
2. obsolete
conspiracy
Derived forms
conspirational
adjective
Word origin
[1275–1325; ME conspiracioun ‹ AF; MF conspiration ‹ L conspīrātiōn- (s. of conspīrātiō), equiv. to conspīrāt(us) (ptp. of conspīrāre to conspire) + -iōn--ion]This word is first recorded in the period 1275–1325. Other words that entered Englishat around the same time include: character, dress, return, reverse, tone-ion is a suffix, appearing in words of Latin origin, denoting action or condition, usedin Latin and in English to form nouns from stems of Latin adjectives (communion; union), verbs (legion; opinion), and esp. past participles (allusion; creation; fusion; notion; torsion)