But, um, concurrently means "at the same time," too. Merriam's first definition is actually "running parallel."
Wouldn't it be better to describe it as running serially, using non-blocking asynchronous function calls? Guess that doesn't really roll of the tongue, though.
In computer science the two terms are generally distinguished, while you're free to redefine them commonly when people say concurrency they refer to a model of performing things at the same time but may not actually be simultaneous. Parallelism is generally the actual act of it running simultaneously.
Wouldn't it be better to describe it as running serially, using non-blocking asynchronous function calls? Guess that doesn't really roll of the tongue, though.