term:

Connive

connive vt

con·nived
con·niv·ing
[Latin con(n)ivere to close one's eyes, knowingly overlook something]
: to assent knowingly and wrongfully without opposition to another's wrongdoing
;specif
: to knowingly consent to a spouse's marital misconduct and esp. to adultery

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.