We have several things in common.    From Wordnet, Princeton University. 

Adjective : common property; common interests. ,a common language or history; a common water-supply system. ,a common defense. ,common knowledge. ,a common event; a common mistake. ,a rough-textured suit of the most common fabric. ,common manners. ,a common soldier; common people; the common man; a common thief. ,the common carotid arteries. ,English nouns are in the common case whether used as subject or object. ,Swedish nouns are either common or neuter. ,French élève,common shares.    From Dictionary.com.