[countable]why someone decides to do something, or the cause or explanation for something that happensCOLLOCATIONS COLLOCATIONS reason (that) reason why reason for (doing) something reason to do something a good reason a compelling reason (=a reason that persuades you) give a reason (for something) for some reason (or other/or another) (=for a reason that you do not know) for personal reasons for sentimental reasons (=because of your feelings, not for practical reasons) for the simple reason (that) for obvious reasons for reasons of something for reasons best known to himself/themselves etc (=used when someone does something surprising) no/any reason whatsoever have your reasons (=have a secret reason for doing something) see no reason why/to do something by reason of somethingformal (=because of something)
The reason I called was to ask about the plans for Saturday.
We'd like to know the reason why she didn't accept the job.
at stand1 (32)GRAMMAR GRAMMAR !! Reason is never followed by of or because.You can talk about the reason forsomething, the reason that something happens , or the reason whysomething happens• Can you explain the reasons for (NOT reasons of) your decision?• The main reason why/that (NOT reason because) I'm writing is to invite you to stay.You can also leave out why or that• I like children, and that's the reason I became a teacher.!! Reasonis not usually followed by against. When you are giving reasons why something is bad, useargument against• An important argument against (NOT reason against) capital punishment is the possibility of error.WORD CHOICE: WORD CHOICE: cause, reasonA causeis something such as an action, event, or situation that makes something happen• The cause of the accident is not known.• a determination to tackle the causes of crimeA reasonis an explanation for something• Can you think of any reason why he would behave in this way? • There is a good reason (NOT a good cause) for my decision. GRAMMARUse the cause of, not 'cause for' or 'cause why'• What is the cause of all this unrest?!!cause for is used in some expressions such as cause for alarm/concern/complaint/optimism/satisfaction• There is no cause for concern. • His remarks give some cause for hope.Use cause somebody to do something, not 'cause that somebody does something'• A cat ran into the road, causing her to brake suddenly (NOT causing that she braked suddenly). ➔ See alsocause
Definition from the Longman Dictionary of Contemporary English Advanced Learner's Dictionary.