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com|mon|al|ity /kɒmənæ l I ti/ (commonalities ) N‑VAR Commonality is used to refer to a feature or purpose that is shared by two or more people or things. [FORMAL ] □ [+ of ] We don't have the same commonality of interest. □ [+ between ] There is an amazing number of commonalities between systems.

co m|mon co ld (common colds ) N‑COUNT [usu sing] The common cold is a mild illness. If you have it, your nose is blocked or runny and you have a sore throat or a cough.

co m|mon cu r|ren|cy N‑UNCOUNT If you say that an idea or belief has become common currency , you mean it is widely used and accepted. □  The story that she was trapped in a loveless marriage became common currency.

co m|mon de|no mi|na|tor (common denominators )

1 N‑COUNT In mathematics, a common denominator is a number which can be divided exactly by all the denominators in a group of fractions.

2 N‑COUNT A common denominator is a characteristic or attitude that is shared by all members of a group of people. □  I think the only common denominator of success is hard work.

3 → see also lowest common denominator

com|mon|er /kɒ mənə ^r / (commoners ) N‑COUNT In countries which have a nobility, commoners are the people who are not members of the nobility. □  It's only the second time a potential heir to the throne has married a commoner.

co m|mon la nd (common lands ) N‑UNCOUNT Common land is land which everyone is allowed to use.

co m|mon la w also common-law

1 N‑UNCOUNT Common law is the system of law which is based on judges' decisions and on custom rather than on written laws. □  Canadian libel law is based on English common law.

2 ADJ [ADJ n] A common law relationship is regarded as a marriage because it has lasted a long time, although no official marriage contract has been signed. □  …his common law wife.

co m|mon ma r|ket (common markets )

1 N‑COUNT A common market is an organization of countries who have agreed to trade freely with each other and make common decisions about industry and agriculture. [BUSINESS ] □  …the Central American Common Market.

2 N‑PROPER The Common Market is the former name of the European Union .

co m|mon nou n (common nouns ) N‑COUNT A common noun is a noun such as 'tree', 'water', or 'beauty' that is not the name of one particular person or thing. Compare proper noun .

co mmon-or-ga rden also common or garden ADJ [ADJ n] You can use common-or-garden to describe something you think is ordinary and not special in any way. [mainly BRIT ] □  It's not just a common-or-garden phone! in AM, use garden-variety

common|place /kɒ mənple I s/ (commonplaces )

1 ADJ [usu v-link ADJ ] If something is commonplace , it happens often or is often found, and is therefore not surprising. □  Foreign vacations have become commonplace.

2 N‑COUNT [usu sing] A commonplace is a remark or opinion that is often expressed and is therefore not original or interesting. □  It is a commonplace to say that movies can manipulate public taste.

co m|mon room (common rooms ) also common-room N‑COUNT A common room is a room in a university or school where people can sit, talk, and relax. [mainly BRIT ]

co m|mon se nse also commonsense N‑UNCOUNT Your common sense is your natural ability to make good judgments and to behave in a practical and sensible way. □  Use your common sense. □  …a common-sense approach.

co m|mon sto ck