"Synchronous activity" refers to a situation where multiple actions or events happen at the same time, or in coordination with one another. It means that people or things are working or moving together in a synchronized manner.
Full definition
The degree
of synchronous activity, or coherence, between cells in the areas was plotted for different objects the monkeys saw.
Group music involves a shared group goal and
synchronous activity, she says.
They also participated in two
synchronous activities that allowed them to have a conversation with a VS teacher and observe her conducting virtual office hours.
Live meetings, chats, discussion forums are
all synchronous activities, while asynchronous events include independent or group task - works, submitting assignments and emailing the course instructor for additional questions.