Commence vs Start

When to use each in English, with meaning, register, and examples.

Commence

FormalTop 3,000 (common)C1verb

Start

Top 1,000 (very common)A1verb
Most formal: CommenceMost common: Start
 CommenceStart
Pronunciation🇬🇧 //kəˈmɛns//🇺🇸 //kəˈmɛns//🇬🇧 /["/stɑːt/","/stɑːts/","/ˈstɑːtɪd/","/ˈstɑːtɪŋ/"]/🇺🇸 /["/stɑːrt/","/stɑːrts/","/ˈstɑːrtɪd/","/ˈstɑːrtɪŋ/"]/
MeaningTo start or begin something.To begin something
ExampleThe ceremony will commence at noon.Please start the engine before we leave.
RegisterFormalNeutral
How commonTop 3,000 (common)Top 1,000 (very common)
CEFR levelC1A1
Part of speechverbverb
Collocationscommence operations, commence proceedings, commence studiessuddenly, immediately, just, decide to, expect to, hope to, as, by, from, get (somebody/​something) started, a good, great, etc. place to start, let’s start, suddenly, immediately, just, decide to, expect to, hope to, as, by, from, get (somebody/​something) started, a good, great, etc. place to start, let’s start
Antonymscease, stop, endstop, finish, end
Common mistakesUsed incorrectly in informal contexts where simpler 'start' would be better., Confused with 'committed' due to similar sounds., Often misspelled as 'comence'.Confused with 'begin' — both mean similar things but are used in slightly different contexts., Used as a noun incorrectly — 'start' is mainly a verb., Misplaced in phrasal verbs — it should not be confused with 'start up' in business contexts.
Usage notesUsed in formal writing and speeches. It's less common in everyday conversation. Often used in legal and professional contexts.Use 'start' for beginning actions or events. It's appropriate in both speaking and writing, but in formal contexts, you might use 'initiate' instead.

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Commence
Start

Frequently asked questions: Commence vs Start

What's the difference between Commence and Start?

Commence: To start or begin something. Start: To begin something

Which is more formal: Commence and Start?

Commence is the most formal of these.

Which is more common: Commence and Start?

Start is the most common in everyday English.

Which is more advanced: Commence and Start?

Commence is the highest level, at C1, on the CEFR scale.

Are Commence and Start the same CEFR level?

Commence: C1, Start: A1 on the CEFR scale.

What part of speech are Commence and Start?

Commence: verb, Start: verb.

Can you show an example of each?

Commence: The ceremony will commence at noon. Start: Please start the engine before we leave.

Can I use Commence and Start interchangeably?

Not always. Commence and Start are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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