From Longman Dictionary of Contemporary Englishcertaincer‧tain1 /ˈsɜːtn $ ˈsɜːr-/ ●●●S1W1 adjective1[not before noun]SUREconfident and sure, without any doubts syn surecertain (that)I’m absolutely certain that I left the keys in the kitchen.I felt certain that I’d passed the test.certain who/what/how etcI’m not certain when it will be ready.certain about/ofNow, are you certain about that?They were watching him. He was certain of it.► see thesaurus at sureRegisterIn everyday English, people usually say sure rather than certain: I’m sure I gave him the money.2CERTAINLY/DEFINITELYif something is certain, it will definitely happen or is definitely trueIt now seems certain that there will be an election in May.Many people look certain to lose their jobs.It is wise to apply early to be certain of obtaining a place.It’s not certain where he lived.His re-election was considered virtually certain.It is by no means certain that the deal will be accepted.If they stayed in the war zone they would face certain death.3 →make certain4 →for certain5[only before noun] used to talk about a particular person, thing, group of things etc without naming them or describing them exactlyThe library’s only open at certain times of day.I promised to be in a certain place by lunchtime.There are certain things I just can’t discuss with my mother.certain kind/type/sortthe expectation of a certain kind of behaviourin certain circumstances/cases etcExtra funding may be available in certain circumstances.6 →a certainCOLLOCATIONS – Meaning 2: if something is certain, it will definitely happen or is definitely truephrasesit seems certain that …It seemed certain that the other team would win.somebody seems/looks/appears certain to do somethingFor a while the whole project looked certain to fail.something is by no means certain (=not definite)Victory was by no means certain for Smith.something is far from certain (=not definite)Success is far from certain.adverbsfairly certainOpposition to the changes is fairly certain.almost/virtually certainIt is almost certain that she will be given a prison sentence.Prices are virtually certain to increase.nounscertain deathIf they stayed in the war zone, they faced almost certain death.THESAURUS – Meaning 2: if something is certain, it will definitely happen or is definitely truecertain if something is certain, you are completely sure that it will happen or is trueSuccess seems certain.It is almost certain that there will be a change of government.Nobody knows exactly who built the manor, but it is certain that an architect called John Sturges supplied the drawings. definite if something is definite, it is certain because someone has officially stated that it will happen, is true etcI hope you can give me a definite answer soon.The wedding will be next summer but a definite date has not been arranged yet.I’ve got a good chance of getting the job, but it’s not definite yet.inevitable if something, especially something bad, is inevitable, it is certain to happen and you cannot do anything to prevent itWar now seems inevitable.It was inevitable that he would find out her secret sooner or later.Facial wrinkles are the inevitable result of aging.be bound to if something is bound to happen, it is very likely to happen, especially because that is what usually happens in that kind of situation. Be bound to is less formal than certain and is very common in everyday spoken EnglishThe kids are bound to be hungry when they get home – they always are.My car broke down today. It was bound to happen sooner or later.be assured of something formal to be certain to get something good, or to be successfulAfter the success of its recent single, the band is now assured of a contract with a major record company.He is is virtually assured of becoming the next prime minister. Our clients are assured of comfortable accommodation and the attention of our trained staff.something is a foregone conclusion if something is a foregoneconclusion, its result is certain even though it has not happened yetThey were winning by such a large margin that victory seemed to be a foregone conclusion.Party members believe it is a foregone conclusion that he will resign.
certain• You have to be a certainheight to go on some of the rides.• There are certain things I just can't talk to my mother about.• Some vegetables are only available at certaintimes of the year.• In certain ways Martha's good to work for, but she's really sarcastic.From Longman Business Dictionarycertaincer‧tain /ˈsɜːtnˈsɜːrtn/ adjectivea sum certainLAW an amount of money that cannot be changed or have anything added to ita written order requiring the importer to pay a sum certain in the exporter’s domestic currency