This page lists 4 conjunctions that start with U, running alphabetically from “Unless” to “Until such time as”. They include single words and longer phrases that link ideas about conditions and time. You can use them to set exceptions, mark when something ends, or write formal statements in contracts, notices, and everyday speech.

Conjunctions are words or phrases that join clauses and show how ideas relate to each other. “Until” is a good example: it comes from Old Norse, and its shorter form “till” is actually the older of the two.

Below you’ll find the table with the conjunction, its definition, an example usage, and a description.

Conjunction: The word or phrase itself, listed alphabetically so you can quickly find the one you need and see how it is spelled.

Definition: A short explanation of what the conjunction means and how it connects clauses, so you understand its exact role in a sentence.

Example usage: A complete sentence showing the conjunction in context, which helps you copy the pattern correctly in your own writing and speech.

Description: Extra notes on tone, formality, and common uses, so you know when the conjunction fits best and when another option works better.

Conjunctions

ConjunctionDefinitionExample usage
UnlessA subordinating conjunction meaning “except if” or “if not”; it introduces a condition that must be met to avoid a result.We’ll go for a hike tomorrow unless it rains.
UntilA subordinating conjunction meaning “up to the time that”; it marks the point at which an action or state ends.Wait here until I come back.
Unless and untilA compound conjunction phrase meaning “not before, and only when” a condition has been met; it joins a condition with a time limit.The contract is not binding unless and until both parties sign it.
Until such time asA multi-word subordinating conjunction meaning “until the moment when”; it is often used when the end point is uncertain.The road will stay closed until such time as repairs are finished.

Descriptions

Unless
One of the most common conditional conjunctions in English. It sets up an exception, so the main clause is true only when the condition in the unless-clause is not.
Until
A time conjunction that links an ongoing action to the moment it stops. It can also work as a preposition, as in “until Friday.” Its shorter, informal form is “till.”
Unless and until
A formal, emphatic phrase often found in legal and official writing. It stresses that something does not apply before a condition is met and starts applying once it is.
Until such time as
A formal, slightly wordy way to say “until.” It is common in announcements and policies, where the exact end point is not known in advance.
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