simultaneously

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/ˌsaɪməlˈteɪniəsli/
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Happening, existing, or being done at the same time.

Examples

  • Several users tried to log in simultaneously.
  • The app can stream audio and record video simultaneously.
  • The two meetings started simultaneously.
  • Both witnesses spoke simultaneously, so the judge asked them to stop.
  • The lights changed simultaneously across the whole stage.

Similar words

at the same time
together
all at once
at once
in parallel
concurrently
synchronously
in concert

Meanings

Usage

Simultaneously is useful when timing is the point. Use it for actions that truly overlap, and choose at the same time when a plainer, more conversational phrase is better.

Common mistakes

The two events happened simultaneous is missing the adverb ending. Another common slip is pairing simultaneously with at the same time, which usually repeats the same idea.

Etymology

Formed from simultaneous plus the adverb suffix -ly. Simultaneous comes through Latin simul, meaning "at the same time" or "together", with the English suffix -aneous used in adjectives such as instantaneous.

FAQ

What does simultaneously mean?

It means that two or more things happen, exist, or are done at the same time.

Is simultaneously an adverb?

Yes. It is an adverb formed from the adjective simultaneous plus -ly.

Can I say at the same time instead of simultaneously?

Yes. At the same time is plainer and more conversational, while simultaneously is more precise and often more formal.

What is the difference between simultaneous and simultaneously?

Simultaneous is an adjective, as in simultaneous events. Simultaneously is an adverb, as in the events happened simultaneously.

Is simultaneously formal?

It is neutral but often sounds more formal than at the same time, especially in everyday conversation.

What are synonyms of simultaneously?

Common synonyms include concurrently, together, at the same time, all at once, and in parallel.

Can simultaneously describe feelings?

Yes. A person can be happy and anxious simultaneously if both feelings are present at the same time.

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