Start and commence can both mean to begin something, so sentences such as “The meeting will start at 10” and “The meeting will commence at 10” can describe the same basic event. The main difference is not the beginning itself. It is the word’s range and tone.
Start is the normal, flexible choice in everyday American English. It works for activities, events, machines, businesses, journeys, sports, and many fixed expressions. Commence is a formal verb. It often appears in official notices, ceremonies, proceedings, scheduled operations, and deliberately elevated writing.
That overlap causes confusion, but the safest choice is usually simple: use start unless the context calls for a distinctly formal tone.
Quick Answer
Both start and commence are correct when they mean “begin.” Use start for most everyday speaking and writing because it is broader and more natural in ordinary contexts. Use commence when you want a formal, official, ceremonial, or bookish tone. They are not interchangeable in every sentence because start also has noun uses, fixed expressions, and meanings that commence does not share.
Why People Confuse Them
The confusion comes from their large area of shared meaning. A meeting can start at noon or commence at noon. Work can start Monday or commence Monday. In those examples, the event begins either way.
The difference becomes clearer outside that shared meaning. English speakers naturally say start the car, a fresh start, a head start, and a false start. Substituting commence in those expressions does not work naturally.
Another source of confusion is the idea that a more formal word is automatically a better word. It is not. Formality should match the situation.
Key Differences At A Glance
- Start: common in everyday speech and writing; functions as both a verb and a noun; has a wide range of meanings and fixed expressions.
- Commence: primarily a formal verb in modern American English; means to begin or enter upon an action, process, event, or proceeding.
- Shared use: both can describe an event, activity, process, or work beginning.
- Main choice: choose start for ordinary communication and commence when a formal register is useful or expected.
- Important limit: do not replace start with commence in expressions such as head start, false start, or start the engine.
Meaning and Usage Difference
As verbs, start and commence overlap when the meaning is simply “begin.”
- “The workshop starts at 9.”
- “The workshop commences at 9.”
The first sentence sounds normal in an everyday schedule. The second sounds more formal.
Start has a much wider range. It can describe activating a machine, creating a business, beginning a journey, entering a game, or making a sudden movement. Commence does not naturally replace start in many of those uses.
Both verbs can be transitive or intransitive in their shared “begin” sense:
- Transitive: “They started the review.” / “They commenced the review.”
- Intransitive: “The review started.” / “The review commenced.”
Both are regular verbs: started/starting and commenced/commencing.
Tone, Context, and Formality
Start is neutral and broadly appropriate. It works in conversation, workplace messages, instructions, news writing, school writing, and formal documents when no special formality is needed.
Commence has a noticeably more formal or bookish feel. It can fit an official announcement, legal proceeding, ceremony, formal schedule, or institutional notice:
“The hearing will commence at 9:30 a.m.”
In a casual message such as “Let’s commence lunch,” the word may sound stiff or intentionally humorous. That does not make it grammatically incorrect; it simply makes the tone unusual for the situation.
Which One Should You Use?
Use the word that matches both the meaning and the setting.
| Context | Best Choice | Why |
| Everyday conversation | Start | Natural and direct |
| Casual workplace message | Start | Clear without unnecessary formality |
| Starting a car or machine | Start | This is the established everyday verb |
| Beginning a business | Start | Standard wording in ordinary US English |
| Formal ceremony announcement | Commence | Matches an official or ceremonial tone |
| Formal proceeding or operation | Commence | Common in institutional wording |
| Fixed expression such as “head start” | Start | Commence cannot replace it |
When either verb is grammatically possible, start is usually the safer default. Choose commence because the register fits, not because it seems more sophisticated.
When One Choice Sounds Wrong
Some sentences allow both words:
- “Construction will start in April.”
- “Construction will commence in April.”
Other sentences strongly favor start:
- Natural: “Start the engine.”
- Unnatural: “Commence the engine.”
The second version fails because start means to set the engine in operation, while commence does not normally carry that machine-activation sense.
The same problem appears with noun uses:
- “We got off to a good start.”
- Not: “We got off to a good commence.”
In modern standard US English, commence is not normally used as the noun that replaces start.
Common Mistakes (and Quick Fixes)
Mistake: Using commence whenever start seems too simple.
Fix: Choose formality for a reason. “The class starts at 8” is already correct and professional.
Mistake: Replacing start inside a fixed expression.
Fix: Keep established phrases such as fresh start, false start, head start, and start over.
Mistake: Using commence for a machine.
Fix: Say start the car, start the computer, or start the engine.
Mistake: Treating commence as the normal noun form.
Fix: Use start when you mean a beginning: “the start of the meeting.”
Mistake: Assuming the words never overlap.
Fix: Remember that events, work, processes, and proceedings can often either start or commence. Tone then becomes the main difference.
Everyday Examples
- “I start work at 8 every morning.” Everyday and natural.
- “The official program will commence at 8.” Formal and suitable for an announcement.
- “Can you start the dishwasher?” Commence would sound unnatural here.
- “The next phase will commence after final approval.” Formal project wording.
- “We need to start over.” This fixed expression requires start.
- “The ceremony commences at noon.” Formal but natural.
- “She started a small business last year.” Start is the normal choice.
- “The court will commence proceedings Monday morning.” Commence fits the official setting.
The examples show the practical pattern: shared “begin” contexts may allow either word, while many everyday and fixed uses belong only to start.
Dictionary-Style Word Details
Verb
- Start: A regular transitive or intransitive verb. In the shared sense, it means to begin or cause something to begin. It also has additional uses, including setting a machine in operation and beginning a business, journey, or activity.
- Commence: A regular transitive or intransitive verb meaning to begin, enter upon, or have a beginning. In modern usage, it is generally more formal than start.
Noun
- Start: Commonly used as a noun meaning a beginning, an initial point, or an early advantage, as in “a fresh start” or “a head start.”
- Commence: Not commonly used as a noun in modern standard American English. The usual related noun is commencement, but commence itself is normally treated as a verb.
Synonyms
For their shared meaning, the closest plain alternative to both words is begin. Initiate can fit some formal processes, but it does not replace either word in every context.
Possible opposites depend on the sentence. Stop, finish, and end may contrast with a beginning, but none is a universal opposite for every sense of start or commence.
Example Sentences
- Start: “Please start the presentation when everyone is seated.”
- Start: “The bus starts its route downtown.”
- Commence: “The formal session will commence after the opening remarks.”
- Commence: “The company will commence operations at the new facility next month.”
Word History
Start comes from the Germanic side of English and developed from older forms connected with sudden movement before taking on broader senses of beginning and setting something in motion.
Commence entered English through French and ultimately has Latin ancestry connected with beginning or initiating. Their histories differ, but present-day word choice should be based on current meaning, context, and tone rather than origin.
Phrases Containing
Start appears in many common expressions: from the start, fresh start, false start, head start, start over, start out, and start off.
Commence appears more often in formal combinations such as commence proceedings, commence operations, commence work, and commence with. These are ordinary collocations rather than everyday idioms.
FAQs
Yes. Both are standard verbs when you mean that an action, event, or process begins. In most ordinary sentences, start is the more natural choice. Commence is also correct, but it usually creates a more formal, official, or ceremonial tone.
No. They overlap when they mean “begin,” but start has additional uses that commence does not share. You can start a car, get a head start, or make a fresh start. Replacing start with commence in those expressions would sound wrong.
Often, yes. Commence can sound stiff, official, or even humorous in casual conversation because speakers usually choose start. However, it is not incorrect. It fits naturally when the situation itself is formal, such as a ceremony, official proceeding, or scheduled operation.
Yes. Start commonly works as both a verb and a noun. You can start a meeting, but you can also discuss the start of a meeting. Commence is a verb; the related noun is commencement, not commence.
Use it when the formal tone serves a purpose, not simply to make the sentence sound more impressive. “Work will commence Monday” can fit an official notice. In a routine email, “Work will start Monday” is usually clearer and more natural.
Both can be correct, but the tone decides the better choice. “The meeting starts at 9” is normal in everyday workplace English. “The ceremony will commence at 9” sounds more formal and can suit an official program or announcement.
Conclusion
Start and commence share the basic meaning “begin,” but they do not have the same range or tone. Start is the flexible everyday choice and works as both a verb and a noun. Commence is mainly a formal verb used when official or elevated wording fits the context.
For most modern American English, choose start by default. Choose commence when you intentionally want a formal register and the sentence uses the shared “begin” meaning.
