Source : Webster's Revised Unabridged Dictionary (1913)

Vexation \Vex*a"tion\, n. [L. vexatio: cf. F. vexation.]
   1. The act of vexing, or the state of being vexed; agitation;
      disquiet; trouble; irritation.

            Passions too violent . . . afford us nothing but
            vexation and pain.                    --Sir W.
                                                  Temple.

            Those who saw him after a defeat looked in vain for
            any trace of vexation.                --Macaulay.

   2. The cause of trouble or disquiet; affliction.

            Your children were vexation to your youth. --Shak.

   3. A harassing by process of law; a vexing or troubling, as
      by a malicious suit. --Bacon.

   Syn: Chagrin; agitation; mortification; uneasiness; trouble;
        grief; sorrow; distress. See {Chagrin}.

Source : WordNet®

vexation
     n 1: anger produced by some annoying irritation [syn: {annoyance},
           {chafe}]
     2: the psychological state of being irritated or annoyed [syn:
        {irritation}, {annoyance}, {botheration}]
     3: something or someone that causes anxiety; a source of
        unhappiness; "New York traffic is a constant concern";
        "it's a major worry" [syn: {concern}, {worry}, {headache}]
     4: the act of troubling or annoying someone [syn: {annoyance},
        {annoying}, {irritation}]