Difference Between Until and As long As

The words until and as long as are commonly used in our day-to-day life to indicate something related to a particular time. Both of these words could be mistakenly used interchangeably sometimes.


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Key Takeaways

  1. “Until” indicates the end of a specific time frame or condition; “as long as” implies a continuing state or action under certain conditions.
  2. “Until” is used when a change is expected after a specified point, whereas “as long as” suggests that the status quo will be maintained given certain circumstances.
  3. Example: “Wait here until I return” (action ends when the speaker returns); “You can stay as long as you want” (action continues based on the listener’s desire).

Until vs As Long As

Until can be used as a conjunction and preposition as it gives the meaning of the end of some action. For example, “The project can’t proceed further until you identify the errors.” As long as can be used as a conjunction and idiom. It shows the continuity of the action that is still happening.

Until vs As long As

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While ‘until’ is a word, ‘as long as’ is a phrase. The term ‘until’ denotes or refers to a particular time, while the word ‘as long as’ refers to a specific duration of time.

The word ‘until’ generally speaks of a future event or condition, while ‘as long as’ talks more of a present action or state. While ‘until’ indicates any time in the future, ‘as long as’ has some conditional element.


Comparison Table

Parameter of ComparisonUntilAs long as
MeaningThe word until refers to or indicates up to a specific time limit or before it.The phrase means something that continues the whole time or provides that.
DerivativeThe word is derived from the two old Scandinavian syllables- un and till- with the same meaning.The word long originates from Old English and Dutch words lang or longus.
UsageThe word ‘until’ is used as a preposition and conjunction according to the sentence’s meaning.The phrase ‘as long as’ can be used as a conjunction between sentences or even as an idiom sometimes.
SynonymsMany other words have a similar meaning to ‘until’ like: till, up to, up until, before, in advance of, etc.Many other words have a similar meaning to ‘as long as,’ like, because of, as much as, all in all, in light of, etc.
Examples· We sang songs until dawn.
· She will not be able to leave the hostel until Friday.
· I can stay here as long as the program ends.
· As long as you study, you can clear the exams.


When to Use the Word Until?

The word ‘until’ means up to a specific time limit. The word ‘till’ is derived from the Old English term, Proto-Germanic term, ‘tila’, which meant a planned point in time and many more Swedish, Gothic and German words which meant the same.

The word ‘till’ is considered colloquial in Modern English and has often been replaced by ‘until’ and ‘to’.  The term ‘until’ is used as a preposition and conjunction.

The word ‘until’ can be used as a preposition, always followed by a noun to indicate a specific happening up to a particular point in time and then stopping. It can be used as a preposition in the following two senses:

  • To indicate that if something happens up to a specific time, it will happen before and end at that time.


  1. Until 2020, he was the commander of the army.
  2. We shared our things until he came.
  • They are used with a negative to emphasize a condition, after which the statement will become true.


  1. The New Act won’t take effect until the end of this financial year.
  2. It was not until 1999 that a new breed of parasites was found.

The word ‘until’ can also be used as a conjunction to indicate a time up to the event mentioned earlier. For example, ‘I will stay with her until her mom returns’.


When to Use the Phrase As long As?

The term ‘as long as’, sometimes substituted as ‘so long as’, is used to mean a specific plan or idea, often in the future. The future action is always indicated in the present simple form after the word ‘as long as’ is used.

The word ‘long’ originates in Old English words like ‘lang’, which means “having a great linear extent that extends from end to end”, or even from old Proto-Germanic words like ‘Langa’, which has similar meanings.

The phrase ‘as long as’ is used as a conjunction between sentences. This phrase has been used at different times to mean the following:

  • To put the condition of time on action.


  1. The car will keep running if you fill it with petrol.
  2. I will look after her kids if she does not return.
  • To indicate that ‘if something is provided.’


  1. My mother has been a regular visitor to this clinic for as long as I remember.
  2. She will take care of me as long as she can.
  • To denote that a particular condition has to be met.

Examples: As long as he promises to be careful, I’ll let him ride my new car.

Main Differences Between Until and As Long As

  1. The word ‘until’ is used as a preposition and a conjunction, while ‘as long as’ can be used as a conjunction and, sometimes, even as an idiom.
  2. The main difference between until and as long as is that while ‘until’ talks about a future event, ‘as long as’ talks about a present condition or action.
  3. ‘Until’ specifies the time up to a certain point in the future, while ‘as long as’ focuses more on the duration of the time between two events.
  4. ‘Until’ is usually used to refer to a period that will end when something happens, or someone does something or maybe not, while ‘as long as’ refers to a time that is conditional and would happen on the acceptance of a situation or condition.
  5. The word ‘until’ can be used as a conjunction to mean ‘up to that time’, ‘before’, and ‘to the point that’, while the word ‘as long as’ can be used to mean ‘during that time’, ‘since’, or ‘on the condition that’.

Difference Between Until and As long As
  1. https://www.etymonline.com/word/long
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