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incentive stock option
incentive zoning
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incertitude
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incest

in·cest [ ín sèst ]


noun 
Definition:
 
sex between close relatives: sexual activity between two people who are considered, for moral or genetic reasons, too closely related to have such a relationship. Incest is regarded as a serious taboo in almost every society, although cultures differ as to the extent to which marriages are allowed between relatives.

[13th century. < Latin incestus< castus "pure"]
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