duo|de|nal /djuː oʊdiː n ə l, [AM ] duː -/ ADJ [ADJ n] Duodenal means relating to or contained in the duodenum. [MEDICAL ] □ …duodenal ulcers.
duo|denum /djuː oʊdiː nəm, [AM ] duː -/ (duodenums ) N‑COUNT Your duodenum is the part of your small intestine that is just below your stomach. [MEDICAL ]
duo|po|ly /djuːɒ pəli/ (duopolies )
1 N‑VAR If two companies or people have a duopoly on something such as an industry, they share complete control over it and it is impossible for others to become involved in it. [BUSINESS ] □ They are no longer part of a duopoly on overseas routes.
2 N‑COUNT A duopoly is a group of two companies which are the only ones which provide a particular product or service, and which therefore have complete control over an industry. [BUSINESS ] □ Their smaller rival is battling to end their duopoly.
dupe /djuː p, [AM ] duː p/ (dupes , duping , duped )
1 VERB If a person dupes you, they trick you into doing something or into believing something which is not true. □ [V n + into ] …a plot to dupe stamp collectors into buying fake rarities. □ [V n] We know some sex offenders dupe the psychologists who assess them.
2 N‑COUNT A dupe is someone who is tricked by someone else. □ He becomes an innocent dupe in a political scandal.
du|plex /djuː pleks, [AM ] duː -/ (duplexes )
1 N‑COUNT A duplex is a house which has been divided into two separate units for two different families or groups of people. [AM ]
2 N‑COUNT A duplex or a duplex apartment is a flat or apartment which has rooms on two floors. [AM ]
du|pli|cate (duplicates , duplicating , duplicated ) The verb is pronounced /djuː pl I ke I t, [AM ] duː -/. The noun and adjective are pronounced /djuː pl I kət, [AM ] duː -/. 1 VERB If you duplicate something that has already been done, you repeat or copy it. □ [V n] His task will be to duplicate his success overseas here at home. ● N‑COUNT Duplicate is also a noun. □ Charles scored again, with an exact duplicate of his first goal.
2 VERB To duplicate something which has been written, drawn, or recorded onto tape means to make exact copies of it. □ [V n] …a business which duplicates video and cinema tapes for the movie makers. ● N‑COUNT [oft in N ] Duplicate is also a noun. □ I'm on my way to Switzerland, but I've lost my card. I've got to get a duplicate.
3 ADJ [ADJ n] Duplicate is used to describe things that have been made as an exact copy of other things, usually in order to serve the same purpose. □ He let himself in with a duplicate key.
4 → see also duplication
du|pli|ca|tion /djuː pl I ke I ʃ ə n, [AM ] duː -/ N‑UNCOUNT If you say that there has been duplication of something, you mean that someone has done a task unnecessarily because it has already been done before. □ …unnecessary duplication of resources.
du|plic|it|ous /djuːpl I s I təs, [AM ] duː-/ ADJ Someone who is duplicitous is deceitful. □ He is a possessive, duplicitous and unreasonable man.
du|plic|ity /djuːpl I s I ti, [AM ] duː-/ N‑UNCOUNT If you accuse someone of duplicity , you mean that they are deceitful. [FORMAL ] □ Malcolm believed he was guilty of duplicity in his private dealings.
du|rable /djʊə rəb ə l, [AM ] dʊ r-/ ADJ Something that is durable is strong and lasts a long time without breaking or becoming weaker. □ Bone china is strong and durable. ● du|rabil|ity /djʊə rəb I l I ti, [AM ] dʊ r-/ N‑UNCOUNT □ Airlines recommend hard-sided cases for durability.
du |rable goo ds or durables N‑PLURAL Durable goods or durables are goods such as televisions or cars which are expected to last a long time, and are bought infrequently. [mainly AM ] in BRIT, usually use consumer durables
du|ra|tion /djʊre I ʃ ə n, [AM ] dʊr-/
1 N‑UNCOUNT The duration of an event or state is the time during which it happens or exists. □ He was given the task of protecting her for the duration of the trial. □ Courses are of two years' duration.
2 PHRASE If you say that something will happen for the duration , you mean that it will happen for as long as a particular situation continues. □ His wounds knocked him out of combat for the duration.
du|ress /djʊəre s, [AM ] dʊr-/ N‑UNCOUNT [usu under N ] To do something under duress means to do it because someone forces you to do it or threatens you. [FORMAL ] □ He thought her confession had been made under duress.
Du|rex /djʊə reks, [AM ] dʊ reks/ (Durex ) N‑COUNT A Durex is a condom. [TRADEMARK ]
dur|ing ◆◆◆ /djʊə r I ŋ, [AM ] dʊ r I ŋ/
1 PREP If something happens during a period of time or an event, it happens continuously, or happens several times between the beginning and end of that period or event. □ Sandstorms are common during the Saudi Arabian winter.
2 PREP If something develops during a period of time, it develops gradually from the beginning to the end of that period. □ Wages have fallen by more than twenty percent during the past two months.
3 PREP An event that happens during a period of time happens at some point or moment in that period. □ During his visit, the Pope will also bless the new hospital. USAGE during
Don’t use during
to say how long something lasts. Don’t say, for example, ‘