Common/ˈkɑːmən/ Definition 1 of 5Pro Tip 1/3Frequent Occurrence Used to indicate something you encounter often in everyday life. Seeing smartphones is common nowadays. Pro Tip 2/3Not Unique Suggests a lack of uniqueness or specialness. Using plastic bags is still common, unfortunately. Pro Tip 3/3General Truth Refers to a widely accepted fact or situation. It is common knowledge that the Earth orbits the Sun.