once

Once is a subordinating conjunction used to introduce a clause that indicates a condition or a single occasion when something happens. It often means "as soon as" or "when" and shows that one event will follow immediately after another. It can also express that something happens only one time or on a single occasion. As a conjunction, it is commonly used in conditional or time clauses.

ruOnce — подчинительный союз, который вводит придаточное предложение условия или однократного события. Часто означает «как только» или «когда» и показывает, что одно событие сразу следует за другим. Также может выражать, что что-то происходит только один раз.esOnce — conjunción subordinante que introduce una cláusula de condición o evento puntual. A menudo significa «en cuanto» o «cuando» e indica que un evento sigue inmediatamente a otro. También puede expresar que algo sucede solo una vez.frOnce — conjonction de subordination qui introduit une proposition de condition ou d'événement unique. Elle signifie souvent « dès que » ou « quand » et indique qu'un événement suit immédiatement un autre. Elle peut aussi exprimer qu'une chose ne se produit qu'une seule fois.de„Once“ ist eine unterordnende Konjunktion, die einen Bedingungs- oder einmaligen Ereignissatz einleitet. Oft bedeutet sie „sobald“ oder „wenn“ und zeigt, dass ein Ereignis unmittelbar auf ein anderes folgt; außerdem kann sie ausdrücken, dass etwas nur ein einziges Mal geschieht.ptOnce — conjunção subordinativa que introduz uma oração de condição ou de evento único. Costuma significar «assim que» ou «quando» e indica que um evento segue imediatamente outro. Também pode expressar que algo acontece apenas uma vez.zhOnce 是引导时间或条件状语从句的连词，表示“一……就……”“当……时”，说明一个事件紧接着另一个事件发生；也可表示“曾经”“一次”，强调只发生过一次。arكلمة ربط ثانوية تُدخل جملة شرطية أو حدثًا يقع مرة واحدة، وغالبًا ما تعني «بمجرد أن» أو «حين» وتدل على أن حدثًا يتبع آخر فورًا، وقد تفيد أن شيئًا يحدث لمرة واحدة فقط.

1. Once as a time/condition conjunction (as soon as) B1 formal

   Used to introduce a clause meaning "as soon as" or "when" something happens, often implying immediacy. The action in the main clause occurs right after the event in the once-clause. It is frequently used with present simple in the subordinate clause to refer to future events.

   • Once you finish your homework, you can watch TV.
   • Call me once you arrive at the airport.
   • Once the rain stops, we will go for a walk.
   • She promised to help once she has more free time.
   • Once I understand the problem, I can solve it quickly.

   ruСоюз времени/условия (как только)esuna vez quefrune fois quedeTemporale/ konditionale Konjunktion (sobald)ptConjunção temporal/condicional (assim que)zh时间/条件连词（一…就）arحرف شرط زماني (بمجرد أن)

2. Once meaning "on one occasion" or "only once" B1 formal

   As a conjunction or adverbial conjunction, it can emphasize that something happens only a single time or on one specific occasion. It highlights singularity or a unique instance rather than repetition.

   • Once you make a mistake like that, it's hard to forget.
   • Once in a lifetime you get such an opportunity.
   • He visited Paris only once in his life.
   • Once you try this dish, you'll want to eat it again.
   • Don't worry — it only happens once.

   ruЗначение «однажды» или «только один раз»esuna vezfrune foisdeBedeutung „einmal“ oder „nur einmal“ptSentido de «uma vez» ou «apenas uma vez»zh“一次”或“仅仅一次”的含义arمعنى «مرّة واحدة» أو «مرّة فحسب»

3. Once in conditional or hypothetical contexts B2 formal

   Used in conditional sentences to mean "if ever" or "if at any time," often carrying a sense of finality or warning. It can also appear in structures expressing a completed single action that changes the situation permanently.

   • Once you sign the contract, you cannot change your mind easily.
   • Once the decision is made, we have to stick to it.
   • Once he starts talking, it's difficult to stop him.
   • Once the door is locked, no one can enter.
   • Once lost, trust is very hard to regain.

   ruВ условных или гипотетических контекстахesuna vez que (en contextos condicionales o hipotéticos)frUne fois que / dès que (conditionnel hypothétique)deIn konditionalen oder hypothetischen KontextenptEm contextos condicionais ou hipotéticoszh用于条件或假设语境arفي السياقات الشرطية أو الافتراضية

The cardinal numeral representing the quantity of a single unit; the first positive integer; the multiplicative identity in arithmetic where any number multiplied by one remains unchanged.

ruОсновное количественное числительное, обозначающее единицу, одиночный предмет или лицо; первое положительное целое числоesNumeral cardinal que designa la unidad o un solo objeto o persona; primer número entero positivo.frAdjectif numéral cardinal désignant le nombre un, un élément unique ou une personne; premier entier positif.deGrundzahlwort, das die Einheit, eine einzelne Sache oder Person bezeichnet; die erste positive ganze Zahl.ptNumeral cardinal que representa a unidade, um único item ou pessoa; o primeiro número inteiro positivo. Também pode indicar algo único ou indivisível.zh基本数词，表示数量一、单个的人或事物；最小的正整数。arالعدد الأساسي الدال على الوحدة أو المفرد أو الشخص الواحد؛ أول عدد صحيح موجب.

1. Cardinal numeral: the number 1 A1 formal

   Used to denote a single person or thing; the first positive integer; the quantity representing a single unit in counting, mathematics, and everyday usage. Serves as the multiplicative identity in arithmetic.

   • I have one apple.
   • She is one year old.
   • One plus one equals two.
   • There is only one way to solve this.
   • He scored one goal in the match.

   ruКоличественное числительное: число 1esNúmero cardinal unofrun (adjectif numéral cardinal)deKardinalzahl: die Zahl 1ptNumeral cardinal: o número 1zh基数词：数字1arالعدد الأصلي: العدد 1

• once multiplicative
• first ordinal