This is the 5467th most frequent Japanese word.
いったん
"いったん" means "once" or "temporarily."
いったん indicates a temporary stop or action before proceeding to do something else.
いったん家に帰ってから、もう一度出かけるつもりです。
I plan to return home and then go out again.
いったん is used to denote an action taken temporarily, suggesting a pause or interim step.
問題集をいったん閉じて休憩しましょう。
Let's close the workbook temporarily and take a break.
いったん is used to indicate an irreversible change that happens once something occurs.