simultaneous

B2 Topic:Describing Qualities

US /ˌsaɪ̯.məlˈteɪ̯.ni.əs/ UK /ˌsɪm.əlˈteɪ̯.ni.əs/ See IPA manual

Freq #24760

Meanings

1

adj
Happening or done at the same time.

The simultaneous accidents caught us by surprise.

Thesaurus

Synonyms

1 adj · happening or done at the... coincident

More coincidental concomitant concurrenthomochronousisochronoussynchronalsynchronicalsynchronous

Opposites

antisynchronousasynchronicasynchronousheterochronousmetachronousnoncoincidentnoncoincidentalnonconcurrentnonisochronousnonsimultaneousnonsynchronouspolychronic

Word family

Derived forms nonsimultaneoussimulcastsimultaneity simultaneously simultaneousnessunsimultaneous

Related forms correspondent simultaneously simultaneousness

Appears in

Phrases (1)

See all

simultaneous operation
the running of two or more processes at the same time

Adjective + noun

Etymology

From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar.

*sem- Proto-Indo-European simultaneus la-med simul Latin

View etymology graph ->

Topics

Describing Qualities

External links

# simultaneous

**Type:** Word
**Level:** B2
**Part of speech:** adj
**IPA (US):** /ˌsaɪ̯.məlˈteɪ̯.ni.əs/
**IPA (UK):** /ˌsɪm.əlˈteɪ̯.ni.əs/
**Frequency rank:** 24760

## Meanings
1. Happening or done at the same time.

## Examples
- The simultaneous accidents caught us by surprise.

## Synonyms
- coincident
- coincidental
- concomitant
- concurrent
- homochronous
- isochronous
- synchronal
- synchronical
- synchronous

## Antonyms
- antisynchronous
- asynchronic
- asynchronous
- heterochronous
- metachronous
- noncoincident
- noncoincidental
- nonconcurrent
- nonisochronous
- nonsimultaneous
- nonsynchronous
- polychronic

## Derived Forms
- nonsimultaneous
- simulcast
- simultaneity
- simultaneously
- simultaneousness
- unsimultaneous

## Related Forms
- correspondent
- simultaneously
- simultaneousness

## Roots and Affixes
- Root: *sem-
- Root: simultaneus
- Root: simul

## Etymology
From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar.

## AI Etymology
Simultaneous is from Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar. Important forms in the word's history include Proto-Indo-European *sem-, la-med simultaneus, Latin simul. In current use it includes the sense Happening or done at the same time.

## Topics
- Describing Qualities

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