This is the 7265th most frequent Japanese word.
並行
"並行" means "parallel" or "occurring simultaneously."
並行 is used to indicate actions being performed simultaneously or in parallel.
彼らは研究を進める一方で並行して開発も行っています。
They are conducting development in parallel as they advance their research.
並行 is used to describe physical or conceptual parallelism between roads.
この道路と並行して走る道は最近作られた。
The road running parallel to this one was built recently.
並行 is used to denote handling tasks or projects at the same time.