Synonyms for Simultaneously

Updated 2026-10-12 · Synonyms List editorial team

Quick answer: Looking for another word for simultaneously? You have many options to describe actions occurring at the exact same time. This list covers closest matches, formal terms, and informal expressions to help you write with clarity and style while avoiding repetition in your text.

Closest Synonyms for Simultaneously

At once: Indicates immediate action without delay, as when friends arrived at once at the party.
Together: Suggests a collective presence or action, like walking together down the street.
Concurrently: Often used in professional contexts to mean running alongside other tasks, such as studying concurrently with a job.
In unison: Implies perfect harmony or timing, perfect for a choir singing in unison.
Side by side: Visualizes proximity and shared action, like children playing side by side in a park.
Hand in hand: Evokes connection and mutual movement, often describing a couple walking hand in hand.
Simultaneous: The direct adjective form used to describe events that are simultaneous in nature.
One and the same: Emphasizes identity and timing, though often used for singular objects rather than timing.
Back to back: Suggests close proximity and simultaneous start, like events scheduled back to back.
In parallel: Refers to things progressing at the same time, like two computers running in parallel.
Jointly: Focuses on shared responsibility or action, as when two people jointly plan a trip.
As one: Conveys a sense of unity in action, like a team moving as one unit.

Formal Synonyms for Simultaneously

Concomitantly: Used in academic or legal writing to show things occurring together, like factors concomitantly affecting a result.
Coincidentally: Highlights the surprising nature of two events happening at the same time.
Correlatively: Suggests a relationship where changes in one mirror changes in the other.
Conjunctly: Rare but formal, indicating a joint occurrence, often used in legal descriptions.
Coexistentially: Describes the state of existing together, though less common than other terms.
At the same instant: A precise phrase often found in physics or engineering descriptions.
In common time: Metaphorical usage for events moving at the same rhythm or rate.
Mutually: Indicates that two parties act or exist at the same time with equal force.
In tandem: Suggests coordinated effort and movement, like two gears turning in tandem.

Informal Synonyms for Simultaneously

All at the same time: A common spoken phrase emphasizing a busy moment where everything happens together.
Right now: Simple and direct, used to indicate the current exact moment of action.
Right away: Suggests immediate action without waiting, often used in casual instructions.
At the same time: A versatile phrase used in conversation to mean concurrent events.
Together then: A playful, slightly old-fashioned way to suggest doing things together.
Down the line: Sometimes used to mean happening in the near future or concurrently with other plans.
In the same breath: Used metaphorically for saying two things together without pause.
Same time: Short and punchy, often used to suggest agreement or shared timing.
Right off the bat: Emphasizes immediate action at the start, often without waiting for others.

Stronger and Weaker Words

All at once: Weaker in precision than simultaneously; often implies a sudden burst of activity.
Together and at once: Stronger, for emphasis on unity and speed
With a single motion: stronger
Without delay: stronger
All in one stroke: stronger

Antonyms for Simultaneously

Sequentially
One after another
Subsequently
Later
Previously
Alternately
Successively
Separately
Independently
In turn

How to Pick the Right Synonym

Selecting the correct synonym for simultaneously depends largely on the context and the tone you wish to convey. Formal settings like legal documents or scientific papers require precise terms like concomitantly or concurrently, while casual conversation allows for more flexible phrases like all at the same time. Consider whether your sentence emphasizes the exact timing, the shared effort, or the coincidence of events. For instance, in unison works best for synchronized actions like music or marching, whereas jointly is better for shared responsibilities. Always read the sentence aloud to ensure the chosen word flows naturally and maintains the intended meaning without sounding awkward or overly stiff.

Frequently Asked Questions

What is the difference between simultaneously and concurrently?

While often interchangeable, simultaneously emphasizes exact timing, whereas concurrently suggests processes running alongside each other without necessarily starting or ending at the precise same instant, making it more common in project management contexts.

Can you use simultaneously in casual conversation?

Yes, although it sounds a bit stiff, you can use it in casual speech. More natural alternatives include at the same time or all at once, which fit everyday conversation better without sounding overly formal or technical to the listener.

What is a good formal alternative for simultaneously?

Concurrently is the best formal alternative, often found in business or academic writing. Another option is concomitantly, which is even more formal and specifically used to describe factors that occur together in a logical or causal relationship.

Are there any idioms that mean the same as simultaneously?

Yes, idioms like in unison or hand in hand convey simultaneous action through imagery. In unison suggests perfect synchronization, while hand in hand implies moving together with close connection, both adding a vivid layer of meaning beyond simple timing.