x
/ɛks/letter
A1formalcommon/ɛks/The twenty-fourth letter of the English alphabet and the nineteenth consonant, representing the voiceless velar fricative and sibilant cluster /ks/ or /gz/. As a grapheme, 'X' is the third least common letter in English and is rarely seen at the beginning of words. It historically derives from the Greek letter Chi. It functions as the Roman numeral for 10, a symbol for a kiss in informal correspondence, an algebraic variable for an unknown quantity, and a designation for 'extra' or 'experimental'.
ruДвадцать четвёртая буква английского алфавита, согласная. Обычно обозначает сочетание звуков /ks/. Одна из самых редких букв в языке. Используется как римская цифра 10, знак поцелуя в переписке, символ неизвестного в математике и обозначение 'экстра' или 'экспериментальный'.esVigesimocuarta letra del alfabeto inglés, consonante. Suele representar la combinación de sonidos /ks/. Una de las letras menos frecuentes del idioma. Se usa como número romano 10, signo de beso en mensajes, símbolo de incógnita en matemáticas y marca de 'extra' o 'experimental'.frVingt-quatrième lettre de l'alphabet anglais, consonne. Note généralement la combinaison de sons /ks/. Une des lettres les plus rares de la langue. Utilisée comme chiffre romain 10, signe de baiser dans la correspondance, symbole de l'inconnue en mathématiques et désignation de « extra » ou « expérimental ».deDer 24. Buchstabe des englischen Alphabets, ein Konsonant. Er bezeichnet meist die Lautfolge /ks/ und ist einer der seltensten Buchstaben der Sprache. Er wird als römische Zahl 10, als Kusszeichen in Nachrichten, als Symbol für das Unbekannte in der Mathematik und als Abkürzung für 'extra' oder 'experimentell' verwendet.ptVigésima quarta letra do alfabeto inglês, consoante. Geralmente representa a combinação de sons /ks/. É uma das letras mais raras da língua. Usada como algarismo romano 10, símbolo de beijo em mensagens, símbolo de incógnita na matemática e designação de 'extra' ou 'experimental'.zh英语字母表的第二十四个字母，辅音字母。通常表示 /ks/ 的音。是英语中最少见的字母之一。用作罗马数字 10、书信中的亲吻符号、数学中的未知数符号，以及表示“额外”或“实验性”。arالحرف الرابع والعشرون في الأبجدية الإنجليزية، وهو حرف ساكن يُنطق عادةً مركّبًا من صوتي /ks/. من أندر الحروف في اللغة، ويُستعمل للدلالة على الرقم 10 في الترقيم الروماني، ورمزًا للقبلة في المراسلات، وللمجهول في الرياضيات، وللدلالة على 'إضافي' أو 'تجريبي'.
- The twenty-fourth letter of the English alphabet A1 formal
The uppercase or lowercase character (X, x) that constitutes the twenty-fourth symbol in the Latin-based English alphabet, classified as a consonant. It most often represents the consonant cluster /ks/. It is the third least common letter in English, and words beginning with X are often of Greek origin. It is unique for its strong association with mathematical notation and pop culture symbols.
- The word 'xylophone' begins with the letter X.
- In the word 'exit', the letter X is pronounced as /ks/.
- X is one of the rarest letters in the English alphabet.
- The NATO phonetic word for X is 'X-ray'.
- The pirate map had a large red X marking the spot.
ruДвадцать четвёртая буква английского алфавитаesLetra XfrLa lettre XdeVierundzwanzigster Buchstabe des englischen AlphabetsptVigésima quarta letra do alfabeto inglêszh英语字母表的第二十四个字母arالحرف الرابع والعشرون من الأبجدية الإنجليزية
- The Roman numeral for 10 A2 formal
The symbol X used in the Roman numeral system to represent the cardinal number ten (decem in Latin). It is a fundamental component for constructing numbers from 9 (IX) to 39 (XXXIX) and beyond in combination with other symbols. It is widely seen on clock faces, movie sequels, and formal event numbering.
- Super Bowl X was played in 1976.
- Chapter X is the final chapter of the book.
- The clock face uses X for the number 10.
- The number 29 in Roman numerals is written as XXIX.
- Pope Leo X was a member of the Medici family.
ruРимская цифра 10esX, número romano para diezfrLe chiffre romain XdeRömische Ziffer 10ptAlgarismo romano 10zh罗马数字10arالرقم الروماني 10
- A symbol for a kiss A2 informal
The letter X used as a symbolic representation of a kiss in informal written correspondence, such as letters, greeting cards, and text messages. It often appears in sequences (e.g., 'XXX') and is frequently paired with 'O', which symbolizes a hug. This tradition originated in medieval times, when an X was used to sign documents as a mark of sincerity, with the signer then kissing the mark.
- She signed off her text with 'Love you, XOXO'.
- I'll miss you! Sending lots of Xs and Os.
- The card ended with a simple 'X' from a secret admirer.
- Put an X at the bottom of the letter for a kiss.
- Her emails to her mom always end with three X's.
ruПоцелуй (в переписке)esSímbolo de besofrSymbole pour un baiserdeKuss (in der Korrespondenz)ptBeijo (em correspondência)zh亲吻（书信中）arقبلة (في المراسلات)
- The symbol for an unknown variable in mathematics A2 formal scientific
The lowercase letter x used as the standard symbol for an independent, unknown, or variable quantity in algebra, analytic geometry, and calculus. It is the most iconic mathematical symbol, solving for x being tantamount to finding a solution. It originated from the Arabic word 'shay' (thing), translated into Spanish as 'xei', which was later abbreviated to x.
- Solve the equation for x: 2x + 3 = 7.
- The x-axis runs horizontally on a graph.
- If f(x) = x², find the value of the function when x = 5.
- The unknown quantity x is the key to the problem.
- Algebra students spend a lot of time solving for x.
ruНеизвестная переменная (в математике)esIncógnita en matemáticasfrx, symbole de l'inconnue en mathématiquesdeUnbekannte Variable (Mathematik)ptIncógnita (em matemática)zh未知变量（数学中）arالمتغير المجهول في الرياضيات
- A designation for 'extra' or 'experimental' B1 informal
The letter X used as an abbreviation or prefix to denote something extra, extreme, or experimental. It commonly appears in product branding (e.g., iPhone X), clothing sizes (XL, XS), and entertainment ratings (X-rated). It evokes a sense of mystery, power, or the cutting edge, and is frequently leveraged in marketing to imply something advanced or forbidden.
- The X-Men team consists of mutants with extraordinary powers.
- He bought a new iPhone X on the day of its release.
- XL shirts provide extra room for a looser fit.
- The movie was rated X for its extreme content.
- The experimental aircraft was dubbed the X-15.
ruЭкстра, экспериментальный или экстремальныйesX como 'extra' o 'experimental'frX (désignation pour « extra » ou « expérimental »)deExtra, experimentell oder extremptExtra ou experimentalzh额外、实验性或极端arإكس للدلالة على الإضافي أو التجريبي أو المتطرف