simultaneity: meaning, definition, pronunciation and examples
C1Formal, Academic, Technical
Quick answer
What does “simultaneity” mean?
The quality or state of happening or being done at exactly the same time.
Audio
Pronunciation
Definition
Meaning and Definition
The quality or state of happening or being done at exactly the same time.
The occurrence of two or more distinct events, processes, or phenomena at the same instant, or the philosophical and physical concept concerning events in time and space.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling is consistent. Slightly more common in British academic writing due to historical philosophical traditions.
Connotations
Neutral and technical in both varieties.
Frequency
Low frequency in everyday speech in both regions; higher in academic/technical contexts.
Grammar
How to Use “simultaneity” in a Sentence
[the] + simultaneity + of + NOUN PHRASE (events/actions)simultaneity + between + NOUN PHRASE + and + NOUN PHRASEwith + simultaneityVocabulary
Collocations
Examples
Examples of “simultaneity” in a Sentence
verb
British English
- The events were found to simultanise with uncanny precision.
- We cannot simultanise the two processes.
American English
- The events were found to simultaneize with uncanny precision.
- We cannot simultaneize the two processes.
adverb
British English
- [No standard adverbial form derived directly from 'simultaneity'. Use 'simultaneously'.]
American English
- [No standard adverbial form derived directly from 'simultaneity'. Use 'simultaneously'.]
adjective
British English
- The simultaneity problem is central to the theory.
- They conducted a simultaneity analysis.
American English
- The simultaneity problem is central to the theory.
- They conducted a simultaneity analysis.
Usage
Meaning in Context
Business
Rare. Might be used in high-level project management, e.g., 'The simultaneity of the global product launches was crucial.'
Academic
Common in philosophy, physics, media studies, and history. E.g., 'Einstein's theory of relativity challenged classical notions of absolute simultaneity.'
Everyday
Very rare. Replaced by phrases like 'at the same time'.
Technical
Core term in physics (relativity), computing (parallel processing), and telecommunications.
Vocabulary
Synonyms of “simultaneity”
Vocabulary
Antonyms of “simultaneity”
Watch out
Common Mistakes When Using “simultaneity”
- Misspelling: 'simultan**ai**ty' (incorrect) vs. 'simultan**ei**ty'.
- Using it as a countable noun (e.g., 'a simultaneity'). It is almost always uncountable.
- Overusing in everyday contexts where 'at the same time' is more natural.
FAQ
Frequently Asked Questions
No, it is a formal, academic, and technical word (C1 level). In everyday conversation, people say 'at the same time'.
'Simultaneity' describes the state or fact of occurring at the same instant. 'Synchronization' is the active process of causing things to occur at the same time or rate.
Extremely rarely. It is almost always an uncountable, abstract noun. You would not say 'simultaneities' in standard usage.
In American English, it is often pronounced with a long 'e' sound: /ˌsaɪməl-tə-ˈnee-ə-tee/ (sye-muhl-tuh-NEE-uh-tee).
The quality or state of happening or being done at exactly the same time.
Simultaneity is usually formal, academic, technical in register.
Phrases
Idioms & Phrases
- “[No common idioms. The word itself is technical.]”
Learning
Memory Aids
Mnemonic
Think of 'SIMULTANEOUS' + 'ITY'. 'Simul' is Latin for 'at the same time' (like 'simulate' originally meant to pretend at the same time). The '-ity' makes it a noun state.
Conceptual Metaphor
TIME IS SPACE (events occupying the same point on a timeline).
Practice
Quiz
In which field is the term 'simultaneity' a fundamental and technically precise concept?