On my way.

Mana regeneration per five seconds

When all champions on the enemy team are dead.

Attack Damage

See carry

Stands for away from keyboard. But is often used to refer to someone who is not moving, whether he is away from keyboard or not.

To have tower aggro means the tower is targeting (and so attacking) you. You can lose tower aggro by stepping out of range of the tower. You can gain tower aggro by being the first to step within tower range. Or if you enter within range of the tower, say after your minions, then you can still get tower aggro by attacking an enemy champion while un [..]

Area of Effect. AoE spells are spells that do damage in an area as opposed to just on one target.

Ability Power

Armor Penentration. The more ArP you have, the more armor of you ignore of the enemy you are attacking, and so the more damage you do.