common

Mutual; shared by more than one.

Example: The two teams have the common goal of winning the game.

Occurring regularly or frequently; usual.

Example: It is common to find sharks off this coast.

Found in large numbers or in a large quantity.

Example: Sharks are common in these waters.

If two people or things have something in common they, are the same in some way.

Example: University students have a lot in common with high-school students.

Simple, ordinary or vulgar.