Philo. 103

I was doing my Philosophy 103, Logic and Critical Thinking, homework. My professor asked gave us a paper with some exercises to do. One of them was to define words that are commonly used that we may or may not see their relative vagueness and ambiguity, by definition of the logic book. One of them was to define the word Adult. So i looked it up on dictionary dot com and saw this:
–adjective

1.	having attained full size and strength; grown up; mature: an adult person, animal, or plant.

2.	of, pertaining to, or befitting adults.

3.	intended for adults; not suitable for children: adult entertainment.

–noun

4.	a person who is fully grown or developed or of age.

5.	a full-grown animal or plant.

6.	a person who has attained the age of maturity as specified by law.

It struck me as interesting. How would you define an adult?
relatively speaking a 6 year old would refer to his/her parents, a porn site would say 18 or 21(depending in what state, right?), an adult would refer to someone around their age range if not older. I don't believe maturity has an age, i really doubt that people want to turn 18 just so they can say "MATURITY! yeah! score!" which brings me to my next point.
Maturity?
–noun

1.	the state of being mature; ripeness: The fruit will reach maturity in a few days.

2.	full development; perfected condition: maturity of judgment; to bring a plan to maturity.

3.	Finance. a. the state of being due. b. the time when a note or bill of exchange becomes due.

So maturity is a state of being, this i can agree with it.
Just went off on a tangent from my Philosophy Homework.
My bad.
Just wanted to point out that this class is pretty cool.