1.  connivance(n = noun.communication) collusion - agreement on a secret plot;
is a kind of agreement
has particulars: cahoot
Derived form verb connive₂

2.  connivance(n = noun.communication) secret approval, tacit consent - (law) tacit approval of someone's wrongdoing;
is a kind of approval, commendation
Derived form verb connive₁

1.  Intentional failure or forbearance to discover a fault or wrongdoing; voluntary oversight; passive consent or coöperation. [1913 Webster]

2.  Corrupt or guilty assent to wrongdoing, not involving actual participation in, but knowledge of, and failure to prevent or oppose it.

connivance, n.
1 (often foll. by at, in) conniving (connivance in the crime).
2 tacit permission (done with his connivance).

Etymology:
F connivence or L conniventia (as connive)

N  permission, leave, allowance, sufferance, tolerance, toleration, liberty, law, license, concession, grace, indulgence, favor, dispensation, exemption, release, connivance, vouchsafement, authorization, warranty, accordance, admission, permit, warrant, brevet, precept, sanction, authority, firman, hukm, pass, passport, furlough, license, carte blanche, ticket of leave, grant, charter, patent, letters patent, permitting, permissive, indulgent, permitted, patent, chartered, permissible, allowable, lawful, legitimate, legal, legalized, licit, unforbid, unforbidden, unconditional, by leave, with leave, on leave, speciali gratia, under favor of, pace, ad libitum, by all means, yes, avec permissin, brevet d'invention.