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expression in Maths topic

From Longman Dictionary of Contemporary Englishexpressionex‧pres‧sion /ɪkˈspreʃən/ ●●● S2 W2 noun  1 strong feelings/thoughts [countable, uncountable]EXPRESS something you say, write, or do that shows what you think or feelexpression of I decided to go to the meeting as an expression of support.expression of sympathy/thanks/regret etc The letter was a genuine expression of sympathy. Student leaders are demanding greater freedom of expression (=the right to say what you think without being punished).give (political/religious/artistic) expression to something The Socialist Party was founded to give political expression to the working classes. Another writer who seeks to give expression to popular oral culture is José María Arguedas.2 on somebody’s face [countable, uncountable]EXPRESSION ON somebody'S FACE a look on someone’s face that shows what they are thinking or feelingexpression of an expression of surprise There was a blank expression on her face (=no expression on her face). In the photograph he seemed devoid of facial expression (=having no expression on his face). A pained (=worried) expression crossed her face.3 word/phrase [countable]SLWORD, PHRASE, OR SENTENCE a word or group of words with a particular meaning The old-fashioned expression ‘in the family way’ means ‘pregnant’.pardon/forgive/excuse the expression (=used when you think you may offend someone by using particular words) After the climb we were absolutely knackered, if you’ll pardon the expression.see thesaurus at phrase, word4 music/acting [uncountable]APM when you put feeling or emotion into the music that you are making or into your acting5 mathematics [countable] technicalHM a sign or group of signs that represent a mathematical idea or quantityCOLLOCATIONSMeaning 1: something you say, write, or do that shows what you think or feelphrasesfreedom of expression (=the right to say what you think without being punished)Student protestors who demanded greater freedom of expression were rounded up by police.an expression of regretThe military has not offered any expression of regret over the civilian loss of life.an expression of sympathyThere was no apology, no expression of sympathy for what Anna had suffered.an expression of concernHis release from prison provoked expressions of concern from members of the public.an expression of angerShe tried to protect the children from his expressions of anger.somebody’s powers of expression formal (=the ability to say or write what you feel)I tried to put my feelings down on paper, but my powers of expression failed me.verbsgive expression to something formal (=express something)In the book, he gives expression to his political ideals. THESAURUSMeaning 2: a look on someone’s face that shows what they are thinking or feelingexpression a look on someone’s face that shows what they are thinking or feelingHis expression became more serious as he listened to her story.She had a contented expression.He has a very different expression in the next picture.look an expression – used especially with adjectives that describe the expression. Look sounds less formal than expressionShe had a sad look on her face.With a look of relief, he handed her the baby.What’s that look for?She gave me a dirty look (=a look that showed she was angry).face used when talking about someone’s expression, especially in the following phrasesYou should have seen his face!Look at my face. Am I bothered?The boys were making faces (=making strange, silly, or rude expressions which show that you dislike someone)through the window.different types of expressionfrown the expression on your face when you move your eyebrows together because you are angry, unhappy, or confusedWith a frown, she asked, ‘So what’s wrong with that?’smile an expression in which your mouth curves upwards, when you are being friendly or are happy or amusedShe gave him a quick smile.scowl an angry or disapproving expressionThere was a scowl of irritation on his face.glare a long angry lookHe gave her a furious glare, but said nothing.grimace an expression you make by twisting your face because you do not like something or because you are feeling painHis face twisted into a grimace of anguish.sneer an expression that shows you have no respect for something or someone‘That’s what you said last time, ’ she said with a sneer.smirk an expression in which you smile in an unpleasant way that shows you are pleased by someone else’s bad luck or that you think you are better than other peopleHe had a self-satisfied smirk on his face.pout an expression in which you push out your lower lip because you are unhappy that you did not get what you want‘You’re going away?’ she said with a pout. COLLOCATIONSMeaning 2: a look on someone’s face that shows what they are thinking or feelingadjectivessomebody’s facial expressionVictor’s facial expression never changed.a blank/vacant expression (=one that shows no emotion, understanding, or interest)The blank expression on Bobbie’s face gave way to anger.an anxious/troubled/worried expressionShe stood looking at me with an anxious expression.a pained expression (=one that shows you are in pain or feeling upset)A pained expression crossed Rory’s face when he saw them together.a surprised/shocked expressionHe didn’t need to speak – his shocked expression said it all.a puzzled/baffled/bewildered expression (=one that shows you are confused or cannot understand something)I can still recall Dan’s baffled expression when I asked him for an answer.a grim/stern expression (=one that shows you are very strict or angry)Aunty Kitty looked at us with a stern expression and ordered us indoors.an angry/furious expressionHer angry expression turned to one of utter despair.a serious expression (=one that shows you are not joking)I saw the serious expression on his little face and tried not to laugh.a thoughtful expression (=one that shows you are thinking about something)She listened to him with a thoughtful expression on her face.an innocent expression‘It was so late, ’ she continued with an innocent expression, ‘I had to stay the night.’a dazed expression (=one that shows you are unable to think clearly, especially because of a shock or accident)His clothes were torn and there was a dazed expression on his face.a glazed expression (=one that shows you are not concentrating on the things around you)From her glazed expression, he knew she had been taking drugs.a smug expression (=one that shows too much satisfaction with your own cleverness or success)Peter was wearing an unbearably smug expression and waving the tickets in front of me.a bland expression (=one that does not show any emotion)She searched his face for answers, but his bland expression gave nothing away.verbshave an expressionHis face had a puzzled expression.wear an expressionTheir pilot wore an expression of extreme relief.change your expressionThe child did not once cry or change her expression.watch somebody’s expression‘Does it really matter?’ Elizabeth asked, watching his expression closely.see somebody’s expressionI would have liked to see his expression when she told him.read somebody’s expression (=understand how someone is feeling by looking at their expression)In the half light, Ellen could not read his expression.phraseshave an expression on your faceHe had a very serious expression on his face.the expression on somebody’s faceI could tell by the expression on her face that she was angry.a lack of expressionI was surprised at the lack of expression on his face.be devoid of expression formal (=have no expression on your face)His face was totally devoid of expression, but I could sense his anger.an expression of surprise (=one showing that you are surprised)He looked at me with an expression of surprise. COLLOCATIONSMeaning 3: a word or group of words with a particular meaningadjectivesa common expression'Pig out' is a common expression meaning 'to eat a lot'.an old-fashioned/outdated expressionThe old-fashioned expression 'in the family way' means to be pregnant.an idiomatic expression (=an idiom )Try to avoid using idiomatic expressions in an essay.a figurative expression (=one in which words are not used with their literal meaning)Many figurative expressions equate anger with heat.a coarse/vulgar expression (=one that is rude)He came out with some vulgar expressions that I couldn’t possibly repeat.an American/English etc expressionShe remembered the American expression her mother had always used: 'Life’s a breeze'.phrasespardon/forgive the expression (=used when you have said a word or phrase that might offend someone)After the climb, we were absolutely knackered, if you’ll pardon the expression. COLLOCATIONSMeaning 4: when you put feeling or emotion into the music that you are making or into your actingphrasesa means of expressionArt is not just a means of expression, it is also a means of communication.a form of expressionMusic and painting are two completely different forms of expression.adjectivespoetic/literary expression (=expressing something as poetry or in literature)The subject does not easily lend itself to poetic expression.musical expression (=expressing something through music)Charlie Parker took jazz to a new level of musical expression.artistic expression (=expressing something through art)He firmly believes there are not enough outlets for artistic expression in our society.creative expression (=expressing something in a creative way, for example in music or art)They work with the children to encourage creative expression.
Examples from the Corpus
expressionx² + 4 is an algebraic expression.The director was a small, pink-cheeked man with bottle-shaped shoulders and an expression of misleading blankness.Fighting against threats to young children's rights to early childhood opportunities could be seen as an expression of legitimate collective responsibility.It must be done in a context that makes it worth while or it is just an expression of talent or ego.Wearing an expression of utter boredom, Harry turned back to his book."I'm not eating it, " Maria said, with an expression of disgust on her face.Each of the statues has a different facial expression.Whereupon, and still looking up at Papa, I felt my facial expression beginning to change.Knight was a quiet man whose favorite expression was "shucks.""It'll be alright in the end' -- that was my mother's favourite expression.Her expression indicated that the call was urgent.He was looking down, his expression shuttered.His expression became serious as he listened to her story.Try to put a little more expression into the slow passage.The language makes available different types of expressions to do different types of jobs in connecting words to the world.He said he didn't care -- well actually he used a rude expression that I can't repeat!'Shadow-boxing'? I've never heard that expression before!I don't normally use that expression myself, but I've heard other people use it sometimes.You use the expression "break a leg" to wish an actor good luck.The expression on her face told me that she didn't want to discuss it.expression ofan expression of contentmentCrying is an acceptable and healthy expression of grief.blank expression on ... faceThat last night, when the returns started coming in, he had this blank expression on his face.pardon/forgive/excuse the expressionShe's kind of a bitch, if you'll pardon the expression.I was, if you will pardon the expression, absolutely buggered.