o

A sudden expression used to convey surprise, enthusiasm, or a warm greeting, often employed to capture attention or signal a realization. It can also represent a poetic or archaic way of addressing someone directly.

deAusruf des Erstaunens, der Freude, der Anrede oder der Aufmerksamkeitslenkung sowie poetische Anrede.ruВнезапное восклицание, используемое для выражения удивления, восторга, приветствия или привлечения внимания, а также поэтическое обращение.esInterjección repentina usada para expresar sorpresa, admiración, saludo o para llamar la atención, así como apelación poética.frInterjection soudaine utilisée pour exprimer la surprise, l'admiration, un salut ou pour attirer l'attention, ainsi que comme invocation poétique.ptInterjeição súbita usada para expressar surpresa, admiração, alegria, saudação ou para chamar a atenção, além de ser um vocativo poético.zh表示惊讶、喜悦、欢呼或引起注意的感叹词，也用于诗歌中的呼语。arحرف نداء يُستعمل للتعبير عن المفاجأة أو الإعجاب أو الفرح أو التنبيه أو للنداء، ويأتي أيضًا في الخطاب الشعري بمعنى يا.

1. Used to express surprise or strong emotion A1 informal

   An utterance that naturally occurs when a person experiences a sudden feeling of wonder, shock, admiration, or pain. It serves as an immediate vocal reaction before more structured speech is formed.

   • O, I didn't see you standing there in the dark!
   • She looked at the sunset and whispered, 'O, how beautiful it is.'
   • O, that really startled me—don't sneak up like that!
   • The crowd let out a collective 'O' as the fireworks exploded.
   • O, I just remembered where I left my keys!

   deAusdruck von Überraschung oder starker EmotionruИспользуется для выражения удивления или сильной эмоцииes¡Oh! (interjección de sorpresa o emoción)froh (interjection exprimant la surprise ou une émotion forte)ptUsado para expressar surpresa ou emoção fortezh用于表达惊讶或强烈情感arيُستعمل للتعبير عن المفاجأة أو الانفعال الشديد

2. Used as a warm greeting or to attract attention A2 informal

   A friendly, often cheerful call meant to hail someone or draw notice. It appears in casual speech, songs, and festive declarations to establish a connection with the listener or audience.

   • O, there you are! We've been waiting for ages.
   • They sang, 'O come, all ye faithful,' in the candlelit church.
   • O, waiter! Could we get some more drinks over here?
   • He cupped his hands and shouted, 'O, is anyone out there?'
   • O, my dear friend, it's so wonderful to see you again!

   deWird als herzliche Begrüßung oder zum Aufmerksamkeitserregen verwendetruИспользуется как теплое приветствие или для привлечения вниманияesOh (saludo o llamada de atención)frInterjection pour interpeller ou saluer chaleureusementptUsado como saudação calorosa ou para chamar atençãozh用作热情的问候或引起注意arيُستخدم كتحية حارة أو لجذب الانتباه

3. Archaic or poetic form of direct address C1 formal british art

   A stylized particle placed before a name or noun to invoke or entreat someone or something, commonly found in classical literature, prayers, and solemn speeches. It adds a dramatic, reverent, or romantic tone to the phrase.

   • O mighty king, grant us your wisdom in these dark times.
   • The poet wrote, 'O wild West Wind, thou breath of Autumn's being.'
   • O death, where is thy sting?
   • She recited, 'O Romeo, Romeo, wherefore art thou Romeo?'
   • O Lord, hear our prayer and deliver us.

   deArchaische oder poetische AnredeformruАрхаичная или поэтическая форма прямого обращенияes¡Oh! vocativo poéticofrÔ (apostrophe poétique)ptForma arcaica ou poética de tratamento diretozh古语或诗歌中的直接称呼形式arصيغة نداء قديمة أو شعرية

The fifteenth letter of the English alphabet and the fourth vowel, representing a wide range of sounds including the long /oʊ/ as in 'go', the short /ɒ/ or /ɑ/ as in 'hot', and the reduced /ə/ as in 'button'. As a grapheme, 'O' is a symmetrical circle in its uppercase form and an oval in lowercase. It functions as an interjection of surprise, the chemical symbol for oxygen, a designation for zero, a blood type, and the fifteenth item in a sequence.

deDer fünfzehnte Buchstabe des englischen Alphabets, ein Vokal, der verschiedene Laute bezeichnen kann. In seiner Form ein symmetrischer Kreis; steht als Interjektion des Erstaunens, als chemisches Symbol für Sauerstoff, für die Null und für die Blutgruppe O.ruПятнадцатая буква английского алфавита, гласная. Может обозначать несколько различных звуков. В виде буквы представляет собой симметричный круг. Используется как междометие удивления, химический символ кислорода, обозначение нуля и группы крови.esDecimoquinta letra del alfabeto inglés, vocal. Puede representar varios sonidos distintos. Como grafía, es un círculo simétrico. Se usa como interjección de sorpresa, símbolo químico del oxígeno, designación de cero y de grupo sanguíneo.frQuinzième lettre de l'alphabet anglais, une voyelle. Peut représenter plusieurs sons différents. En forme de lettre, c'est un cercle symétrique. Utilisée comme interjection de surprise, symbole chimique de l'oxygène, désignation du zéro et d'un groupe sanguin.ptDécima quinta letra do alfabeto inglês, uma vogal. Pode representar vários sons diferentes e, em sua forma, é um círculo simétrico. É usada como interjeição de surpresa, símbolo químico do oxigênio, designação de zero e tipo sanguíneo.zh英文字母表的第十五个字母，是元音字母，可表示多种不同发音。字形为一个对称的圆圈。也用作表示惊讶的感叹词、化学元素氧的符号、数字零的表示以及血型的标记。arالحرف الخامس عشر من الأبجدية الإنجليزية، وهو حرف متحرك ويمكن أن يمثل أصواتًا متعددة. يُستخدم أيضًا كعلامة على التعجب للحيرة، ورمز كيميائي للأكسجين، ورمز للصفر، وفصيلة الدم.

1. The fifteenth letter of the English alphabet A1 formal

   The uppercase or lowercase character (O, o) that constitutes the fifteenth symbol in the Latin-based English alphabet, classified as a vowel. It is a highly versatile letter representing multiple phonemes, including the diphthong /oʊ/, the short vowels /ɒ/ and /ʌ/, and the schwa /ə/. Its circular shape is one of the most recognizable in the alphabet, and the exclamation 'O' is often used poetically to express emotion.

   • The word 'open' begins with the letter O.
   • The letter O is shaped like a circle.
   • In the word 'hot', the O makes a short vowel sound.
   • She wrote a perfect round uppercase O.
   • The exclamation 'O dear!' expresses surprise or dismay.

   deFünfzehnter Buchstabe des englischen AlphabetsruПятнадцатая буква английского алфавитаesDecimoquinta letra del alfabeto inglésfrLa lettre optDécima quinta letra do alfabeto inglêszh英语字母表的第十五个字母arالحرف الخامس عشر من الأبجدية الإنجليزية

2. The chemical symbol for oxygen B1 formal scientific

   The one-letter chemical symbol representing the element oxygen, atomic number 8. Oxygen is a highly reactive non-metal and oxidizing agent that forms compounds, most notably oxides, with most elements. As a diatomic gas (O₂), it makes up about 21% of Earth's atmosphere and is essential for respiration in most living organisms and for combustion.

   • Water is composed of hydrogen and oxygen, H₂O.
   • The patient was put on an O₂ mask to help with breathing.
   • Liquid O is used as an oxidizer in rocket propellants.
   • The level of dissolved O in the lake is critical for fish.
   • Ozone, O₃, is a molecule consisting of three oxygen atoms.

   deSauerstoff (chemisches Symbol O)ruКислород (химический элемент)esSímbolo químico del oxígenofrSymbole chimique de l'oxygèneptOxigênio (elemento químico)zh氧（化学元素）arالأكسجين (رمز كيميائي)

3. The numeral zero A1 informal

   The letter or symbol O used interchangeably with the numeral 0 (zero) in spoken English, especially when reading sequences of digits aloud, such as phone numbers, room numbers, or years. While typed text typically distinguishes 0 from O, in speech and handwriting the two are often conflated. It represents the integer denoting a null quantity.

   • My phone number is five-five-five, oh-one-two-three.
   • The secret agent's codename is double-oh seven.
   • The room number is one-oh-four.
   • In the year nineteen oh-five, the city was founded.
   • He scored zero, or an 'oh', on the quiz.

   deNull (Ziffer)ruНоль (цифра)esEl cerofrzéro (lu comme la lettre o)ptZero (numeral)zh零（数字0）arالصفر (الرقم)

4. The blood type O B2 formal medical

   A classification of human blood based on the absence of A and B antigens on the surface of red blood cells, with both anti-A and anti-B antibodies present in the plasma. Individuals with type O negative are considered universal donors for red blood cells, while those with type O positive are the most common blood type. It is one of the four main ABO blood groups, inherited from parents.

   • O negative blood can be transfused into almost any patient.
   • She has type O positive, the most common blood type.
   • Hospitals urgently need O negative donors for emergencies.
   • My blood type is O, which I inherited from my mother.
   • Type O blood has no A or B antigens on the red blood cells.

   deBlutgruppe O (I)ruГруппа крови O (I)esGrupo sanguíneo Ofrgroupe sanguin OptGrupo sanguíneo O (I)zhO型血arفصيلة الدم O

An informal spoken or written representation of the digit zero (0), using the letter name 'O' (or 'o') in place of the numeral; commonly used when reciting telephone numbers, room numbers, codes, years, and other sequences where clarity and rhythm are prioritized. Not a true numeral but a colloquial convention in both British and American English.

deInformelle mündliche oder schriftliche Bezeichnung der Ziffer Null (0) unter Verwendung des Buchstabens 'O'; häufig beim Buchstabieren von Telefonnummern, Codes, Jahreszahlen und anderen Zahlenfolgen.ruНеформальное устное или письменное обозначение цифры ноль (0) с использованием буквы 'O'; часто используется при произнесении телефонных номеров, кодов, годов и других последовательностейesForma oral o escrita informal de referirse a la cifra cero (0) usando la letra 'O'; se emplea a menudo al leer números de teléfono, códigos, años y otras secuencias.frDésignation orale ou écrite informelle du chiffre zéro (0) utilisant la lettre « O » ; employée souvent pour énoncer des numéros de téléphone, des codes, des années et d'autres suites de chiffres.ptForma informal, oral ou escrita, de designar o numeral zero (0) usando a letra 'O'; é comum ao ditar números de telefone, códigos, anos e outras sequências.zh数字零（0）的非正式口头或书面说法，用字母“O”表示；常用于念电话号码、验证码、年份或其他数字序列。arاستخدام الحرف اللاتيني O للتعبير عن الرقم صفر (0) في السياقات غير الرسمية، خاصة عند نطق أرقام الهاتف والرموز والسنوات والتسلسلات الرقمية.

1. Informal numeral substitute: the letter O representing zero A2 informal

   Used colloquially to represent the digit 0 when speaking or writing sequences such as phone numbers, account codes, room numbers, or years; valued for its brevity and phonetic clarity in rapid speech. Not appropriate in formal mathematical, scientific, or technical contexts where 'zero' is required.

   • My room number is two-one-O, not two-one-zero.
   • Call me at five-five-five-O-one-two-three.
   • The year nineteen-O-one marked the start of the century.
   • His employee ID ends in double-O.
   • The flight code is BA-O-O-seven.

   deInformelle Zahlwort-Ersetzung: der Buchstabe O für NullruНеформальная замена числительного: буква О вместо нуляesO (cero coloquial)frzéro (lettre O)ptSubstituto informal de numeral: a letra O no lugar do zerozh非正式数字替代：字母O代表零arبديل غير رسمي للعدد: حرف O بدل الصفر

2. Noun: the letter O used as a zero symbol B1 informal

   A noun referring to the Latin letter O employed as a visual or auditory stand-in for the numeral 0; common in informal writing, texting, gaming handles, and spoken sequences where typographic distinction between O and 0 is not critical.

   • In the password, use an O, not a zero.
   • The license plate has three Os at the end.
   • He typed his username with Os instead of noughts.
   • The serial number mixes letters and Os for zeros.
   • In casual notes, she writes O for zero to save time.

   deSubstantiv: der Buchstabe O als NullsymbolruСуществительное: буква О, используемая как символ нуляesletra o usada como cerofrlettre O employée comme zéroptSubstantivo: a letra O usada como símbolo de zerozh名词：用作零符号的字母Oarاسم: حرف O المستخدم رمزًا للصفر