Concurrency is the state of taking place simultaneously or concurrently. While a word with a positive connotation, it is important to recognize antonyms for concurrency. One opposite of concurrency is "sequentiality," which refers to events or processes that occur one after the other in a particular order. Another antonym for concurrency is "singularity," which means something that is occurring by itself without other events happening at the same time. Another antonym for concurrency is sporadic, which refers to irregular and scattered occurrences. These antonyms help us understand the context in which concurrency is appropriate and provide context to its meaning.