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Pronunciation varies by accent · noun
The quality or state of being simultaneous; simultaneity..
Use simultaneousness when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Simultaneousness means The quality or state of being simultaneous; simultaneity..
Common synonyms include concurrentness, synchroneity, coincidence, simultaneousness.
Possible antonyms include asynchronicity, asynchronism, asynchronization, asynchronousness.
Use simultaneousness where its definition matches the intended context.
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