o

• حرف نداء يُستعمل للتعبير عن المفاجأة أو الإعجاب أو الفرح أو التنبيه أو للنداء، ويأتي أيضًا في الخطاب الشعري بمعنى يا.

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.

1. Used to express surprise or strong emotionA1informal

   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.

   يُستعمل للتعبير عن المفاجأة أو الانفعال الشديد

   • 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!

2. Used as a warm greeting or to attract attentionA2informal

   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.

   يُستخدم كتحية حارة أو لجذب الانتباه

   • 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!

3. Archaic or poetic form of direct addressC1formalbritishart

   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.

   صيغة نداء قديمة أو شعرية

   • 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.

• الحرف 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.

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.

1. The fifteenth letter of the English alphabetA1formal

   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.

   الحرف الخامس عشر من الأبجدية الإنجليزية

   • 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.

2. The chemical symbol for oxygenB1formalscientific

   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.

   الأكسجين (رمز كيميائي)

   • 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.

3. The numeral zeroA1informal

   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.

   الصفر (الرقم)

   • 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.

4. The blood type OB2formalmedical

   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.

   فصيلة الدم O

   • 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.

• استخدام الحرف اللاتيني O للتعبير عن الرقم صفر (0) في السياقات غير الرسمية، خاصة عند نطق أرقام الهاتف والرموز والسنوات والتسلسلات الرقمية.

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.

1. Informal numeral substitute: the letter O representing zeroA2informal

   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.

   بديل غير رسمي للعدد: حرف O بدل الصفر

   • 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.

2. Noun: the letter O used as a zero symbolB1informal

   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.

   اسم: حرف O المستخدم رمزًا للصفر

   • 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.