Simultaneously vs Together

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

Simultaneously

Top 2,000 (common) C1 adverb

Together

Top 1,000 (very common) A1 adverb

Most common: Together

	Simultaneously	Together
Pronunciation	🇬🇧 /["/ˌsɪmlˈteɪniəsli/"]/ 🇺🇸 /["/ˌsaɪmlˈteɪniəsli/"]/	🇬🇧 /["/təˈɡeðə(r)/"]/ 🇺🇸 /["/təˈɡeðər/"]/
Meaning	At the same time as something else.	In one place or doing something with others.
Example	The game will be broadcast simultaneously on TV and radio.	We will work together to complete the project.
Register	Neutral	Neutral
How common	Top 2,000 (common)	Top 1,000 (very common)
CEFR level	C1	A1
Part of speech	adverb	adverb
Collocations	happen simultaneously, simultaneously occur, perform simultaneously	come together, work together, stay together, live together
Antonyms	sequentially, consecutively, successively	apart, separately
Common mistakes	Using it incorrectly to mean 'separately'., Confusing it with 'simultaneous' which is an adjective., Misplacing it in a sentence which can alter the meaning.	Confused with 'together' vs 'apart'; forgetting the meaning of isolation., Using 'together' where 'alongside' would be more appropriate., Misplacing it in a sentence; it often goes after the verb.
Usage notes	Use 'simultaneously' to describe two or more actions happening at the same time. It works well in both spoken and written contexts but may sound overly formal in casual conversation.	Use 'together' when describing people or things being united or in the same location. It's not used in formal writing; instead, 'jointly' may be preferred.

See it in real clips

We create and perceive our world simultaneously.

We'd have to hit all banks simultaneously. SWAT teams, backup.

We create and perceive our world simultaneously.

We'd have to hit all banks simultaneously. SWAT teams, backup.

Simultaneously

Breaking Bad › S1 E7

We're gonna make a lot of money together.

Breaking Bad › S1 E2

I guess we'll both do it together.

Breaking Bad › S1 E4

We're family. We get through these things together.

Breaking Bad › S1 E7

We're gonna make a lot of money together.

Breaking Bad › S1 E2

I guess we'll both do it together.

Together

Frequently asked questions: Simultaneously vs Together

What's the difference between Simultaneously and Together?

Simultaneously: At the same time as something else. Together: In one place or doing something with others.

Which is more common: Simultaneously and Together?

Together is the most common in everyday English.

Which is more advanced: Simultaneously and Together?

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

Are Simultaneously and Together the same CEFR level?

Simultaneously: C1, Together: A1 on the CEFR scale.

What part of speech are Simultaneously and Together?

Simultaneously: adverb, Together: adverb.

Can you show an example of each?

Simultaneously: The game will be broadcast simultaneously on TV and radio. Together: We will work together to complete the project.

Can I use Simultaneously and Together interchangeably?

Not always. Simultaneously and Together 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.