The definitions of the word COMMON:
1
belonging equally to, or shared alike by, two or more or all in question:
common property; common interests.
2
pertaining or belonging equally to an entire community, nation, or culture; public:
a common language or history; a common water-supply system.
3
joint; united:
a common defense.
4
widespread; general; ordinary:
common knowledge.
5
of frequent occurrence; usual; familiar:
a common event; a common mistake.
6
hackneyed; trite.
7
of mediocre or inferior quality; mean; low:
a rough-textured suit of the most common fabric.