What does "vanity" mean?

Additional senses

1. 2.An inflation of mind upon slight grounds; empty pride inspired by an overweening conceit of one's personal attainments or decorations; an excessive desire for notice or approval; pride; ostentation; conceit. The exquisitely sensitive vanity of Garrick was galled. Macaulay.
2. 3.That which is vain; anything empty, visionary, unreal, or unsubstantial; fruitless desire or effort; trifling labor productive of no good; empty pleasure; vain pursuit; idle show; unsubstantial enjoyment. Vanity of vanities, saith the Preacher. Eccl. i.
3. 4.Vanity possesseth many who are desirous to know the certainty of things to come. Sir P. Sidney. [Sin] with vanity had filled the works of men. Milton. Think not, when woman's transient breath is fled, That all her vanities at once are dead; Succeeding vanities she still regards. Pope.
4. 5.One of the established characters in the old moralities and puppet shows. See Morality, n., 5. You . . . take vanity the puppet's part. Shak. See Egotism, and Pride.