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2 ADJ If something is concerning , it causes you to feel concerned about it. □  It is particularly concerning that he is working for non-British companies while advising on foreign policy.

con|cert ◆◇◇ /kɒ nsə ^r t/ (concerts )

1 N‑COUNT A concert is a performance of music. □ [+ of ] …a short concert of piano music. □  I've been to plenty of live rock concerts. □  …a new concert hall.

2 PHRASE If a musician or group of musicians appears in concert , they are giving a live performance. □  I want people to remember Elvis in concert.

con|cert|ed /kənsɜː ^r t I d/

1 ADJ [ADJ n] A concerted action is done by several people or groups working together. □  Martin Parry, author of the report, says it's time for concerted action by world leaders.

2 ADJ [ADJ n] If you make a concerted effort to do something, you try very hard to do it. □  He made a concerted effort to win me away from my steady, sweet but boring boyfriend.

con|cert|go|er /kɒ nsə ^r tgoʊə ^r / (concertgoers ) also concert-goer N‑COUNT A concertgoer is someone who goes to concerts regularly.

con|cer|ti|na /kɒ nsə ^r tiː nə/ (concertinas ) N‑VAR A concertina is a musical instrument consisting of two end pieces with stiff paper or cloth that folds up between them. You play the concertina by pressing the buttons on the end pieces while moving them together and apart.

concert|master /kɒ nsə ^r tmɑːstə ^r , -mæst-/ (concertmasters ) N‑COUNT The concertmaster of an orchestra is the most senior violin player, who acts as a deputy to the conductor. [AM , AUSTRALIAN ] in BRIT, use leader

con|cer|to /kəntʃeə ^r toʊ/ (concertos ) N‑COUNT A concerto is a piece of music written for one or more solo instruments and an orchestra. □  …Tchaikovsky's First Piano Concerto. □  …a wonderful concerto for two violins and string orchestra.

con|ces|sion ◆◇◇ /kənse ʃ ^ə n/ (concessions )

1 N‑COUNT If you make a concession to someone, you agree to let them do or have something, especially in order to end an argument or conflict. □  The King made major concessions to end the confrontation with his people. [Also + to/from ]

2 N‑COUNT A concession is a special right or privilege that is given to someone. □ [+ for ] …tax concessions for mothers who stay at home with their children.

3 N‑COUNT A concession is a special price which is lower than the usual price and which is often given to old people, students, and the unemployed. [BRIT ] □ [+ for ] Open daily; admission £1.10 with concessions for children and OAPs. in AM, use reduction 4 N‑COUNT A concession is an arrangement where someone is given the right to sell a product or to run a business, especially in a building belonging to another business. [mainly AM , BUSINESS ] in BRIT, usually use franchise

con|ces|sion|aire /kənse ʃəneə ^r / (concessionaires ) N‑COUNT A concessionaire is a person or company that has the right to sell a product or to run a business, especially in a building belonging to another business. [AM , BUSINESS ] in BRIT, use franchisee

con|ces|sion|ary /kənse ʃ ^ə nri/ ADJ [ADJ n] A concessionary price is a special price which is lower than the normal one and which is often given to old people, students, and the unemployed. [BRIT ] □  There are concessionary rates for students. in AM, use reduced

con|ces|sion|er /kənse ʃənə ^r / (concessioners ) N‑COUNT A concessioner is the same as a concessionaire . [AM , BUSINESS ] in BRIT, use franchisee

con|ces|sive clause /kənse s I v klɔːz/ (concessive clauses ) N‑COUNT A concessive clause is a subordinate clause which refers to a situation that contrasts with the one described in the main clause. For example, in the sentence 'Although he was tired, he couldn't get to sleep', the first clause is a concessive clause. [TECHNICAL ]