Define Adult Meaning

A person who has stopped growing at both ends and is now growing in the
middle.

A soul broken by society; someone who has lost faith in people.

1. The period of your life before death, and after the time when you realize that it is, in fact, NOT cool to paste cut-outs from 'Teen People' onto your binder.

2. The label you give to movies that have copious amounts of the letter 'X' on them.

the reason for so much evil and stupidity on this earth. everything that is wrong on earth is caused by adults and still children gotta respect them.

One old enough to be cruel to, rationalizing that such a person is mature enough to handle whatever you dish out.

a middle aged grown up whos only purpose in life is to annoy and bitch to kids and teenagers. they hate pretty much everything and everyone, mostly their kids because they didnt have a good childhood and are now bitching and complaining about it to every other person 20 years younger than him or her, what a douchebag

A ridiculous person who thinks that everyone who uses myspace will get raped eventually, it's bad for kids to have things easy, and anything with a screen is a portal into hell. basically, shortsighted bastards who exist to annoy rational people.

(noun)
One who thinks they deserve the right to control EVERYTHING there is to control, and usually, in fact most always, results in severe hate by many teenagers everywhere. Mostly practices this believed right on his/her offspring. Does not deserve friends, or a social life.

This definition specifically applies to those who would read it and say to themselves the following thought: "god damn teenagers complain about way too fucking much".

noun:1)An individual who is old enough to take complete responsibility for all of his/her actions. Often described by the goverment as a person who has reached a certain age (e.g. a person 18 years old or more). Adjective: 2)Pertaining to adults. 3)Describing sexually suggestive material.

1. The stage after adolescence.

2. Legally, someone who is (usually, depending in what country you live) 18+.

Now, there is a difference between legally and biologically.
At 18, in most country, you are legally an adult.
But, since most people continue to grow in some way at 18, they can't be considered adults physically.

Even if most people at 18 are "physically" teenagers(they continue to grow), you're still considered an adult, but it's not rare that people who are 18-19 are called "teens" (probably because of the number, eighTEEN, nineTEEN)

It is confusing, since at 18-19, you're both an adult(legal) and teenager(physically).

Because of that confusion, people of that age (18-19) are generally called "young adult".