The Collaborative International Dictionary of English v.0.48:

Connive \Con*nive"\, v. t.
   To shut the eyes to; to overlook; to pretend not to see. [R.
   & Obs.] "Divorces were not connived only, but with eye open
   allowed." --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Connive \Con*nive"\ (k[o^]n*n[imac]v"), v. i. [imp. & p. p.
   Connived (-n[imac]vd"); p. pr. & vb. n. Conniving.] [L.
   connivere to shut the eyes, connive, fr. con- + (perh.) a
   word akin to nicere to beckon, nictare to wink.]
   1. To open and close the eyes rapidly; to wink. [Obs.]
      [1913 Webster]

            The artist is to teach them how to nod judiciously,
            and to connive with either eye.       --Spectator.
      [1913 Webster]

   2. To close the eyes upon a fault; to wink (at); to fail or
      forbear by intention to discover an act; to permit a
      proceeding, as if not aware of it; -- usually followed by
      at.
      [1913 Webster]

            To connive at what it does not approve. --Jer.
                                                  Taylor.
      [1913 Webster]

            In many of these, the directors were heartily
            concurring; in most of them, they were encouraging,
            and sometimes commanding; in all they were
            conniving.                            --Burke.
      [1913 Webster]

            The government thought it expedient, occasionally,
            to connive at the violation of this rule.
                                                  --Macaulay.
      [1913 Webster]

WordNet (r) 3.0 (2006):

connive
    v 1: encourage or assent to illegally or criminally
    2: form intrigues (for) in an underhand manner [syn: scheme,
       intrigue, connive]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "connive":
   accord, agree, angle, associate, be in cahoots, blink at, brew,
   cabal, coact, coadunate, cogitate, coincide, collaborate, collogue,
   collude, combine, complot, concoct, concur, condone, conjoin,
   conspire, contrive, cook up, cooperate, correspond, countermine,
   counterplot, devise, disregard, engineer, finagle, finesse, frame,
   frame up, happen together, harmonize, hatch, hatch a plot,
   hatch up, ignore, intrigue, join, lay a plot, machinate, maneuver,
   operate, overlook, plot, regard with indulgence, rig, scheme,
   synchronize, synergize, tolerate, unite, wangle, wink at