What does anger mean?
The definition of anger
An”ger, n.
Etym: [OE. anger, angre, affliction, anger, fr. Icel. angr affliction, sorrow; akin to Dan. anger regret, Swed. ånger regret, AS. ange oppressed, sad, L. angor a strangling, anguish, angere to strangle, Gr. amhas pain, and to. anguish, anxious, quinsy, and perh. awe, ugly. The word seems to have orig. meant to choke, squeeze.

1 Trouble; vexation; also, physical pain or smart of a sore, etc. [Obs.] I made the experiment, setting the moxa where . . . the greatest anger and soreness still continued. Temple.
2 A strong passion or emotion of displeasure or antagonism, excited by a real or supposed injury or insult to one’s self or others, or by the intent to do such injury. Anger is like A full hot horse, who being allowed his way, Self- mettle tires him. Shak.

Synonyms
— Resentment; wrath; rage; fury; passion; ire gall; choler; indignation; displeasure; vexation; grudge; spleen.
— Anger, Indignation, Resentment, Wrath, Ire, Rage, Fury. Anger is a feeling of keen displeasure (usually with a desire to punish) for what we regard as wrong toward ourselves or others. It may be excessive or misplaced, but is not necessarily criminal. Indignation is a generous outburst of anger in view of things which are indigna, or unworthy to be done, involving what is mean, cruel, flagitious, etc., in character or conduct. Resentment is often a moody feeling, leading one to brood over his supposed personal wrongs with a deep and lasting anger. See Resentment. Wrath and ire (the last poetical) express the feelings of one who is bitterly provoked. Rage is a vehement ebullition of anger; and fury is an excess of rage, amounting almost to madness. Warmth of constitution often gives rise to anger; a high sense of honor creates indignation at crime; a man of quick sensibilities is apt to cherish resentment; the wrath and ire of men are often connected with a haughty and vindictive spirit; rage and fury are distempers of the soul to be regarded only with abhorrence.

An”ger, v. t.
[imp. & p. p. Angered; p. pr. & vb. n. Angering.] Etym: [Cf. Icel. angra.]

1 To make painful; to cause to smart; to inflame. [Obs.] He . . . angereth malign ulcers. Bacon.
2 To excite to anger; to enrage; to provoke. Taxes and impositions . . . which rather angered than grieved the people. Clarendon.