Meaning of “common” - Learner’s Dictionary

common

adjective us uk /ˈkɒmən/
Extra Examples
a common occurrencePainkillers are the most common drugs prescribed by doctors in Britain.Illnesses of this type are very common in children.Statistics show that skin cancer is becoming more common.This condition is four times more common in boys than in girls.
USUAL

B1 happening often or existing in large numbers:

Injuries are common in sports such as hockey.
→ Opposite uncommon
SHARED

B1 belonging to or shared by two or more people or things:

a common goal/interest
English has some features common to many languages.
common knowledge

B2 something that a lot of people know:

[ + that ] It's common knowledge that he spent time in jail.
ORDINARY [ always before noun ]

not special in any way:

The herbs all have common names and Latin names.
LOW CLASS UK

typical of a low social class:

My mum thinks dyed blonde hair is really common.

(Definition of “common adjective” from the Cambridge Learner’s Dictionary © Cambridge University Press)