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Common, ordinary, or shared by many
Este problema es común en estudiantes principiantes.
This problem is common among beginner students.
El español es un idioma común en América Latina.
Spanish is a common language in Latin America.
Often used to describe things that are widespread or typical.
Shared or held in common by a group
Tienen un interés común en la protección del medio ambiente.
They share a common interest in environmental protection.
'Común' refers to what is typical or shared, while 'frecuente' refers to what happens often.
'Común' agrees in gender and number with the noun it modifies (e.g., 'una idea común', 'unos problemas comunes').
From Latin 'communis', meaning 'shared' or 'common'.
Can be used both as an adjective and a noun (e.g., 'lo común' meaning 'the common thing').