Any (determiner)

1. Used to refer to one or some of a thing or number of things, no matter how much or how many.
2. Used to indicate that no particular example of the thing or person referred to is being specified.
3. Used to indicate a maximum or minimum amount.
4. Used to indicate a question or conditional clause.
5. Used to indicate a negative consequence.

Origin:

Old english ǣnig, from ān 'one' + -ig 'having the quality of'.

Examples:

1. I don't have any plans tonight.
2. I'll take any book you're finished reading.
3. Any amount of exercise is better than none.
4. If any of the guests arrives early, please let me know.
5. I don't want any trouble.