This is the 4167th most frequent Japanese word.
一人ひとり
"ひとりひとり" (一人ひとり) means "each person" or "one by one."
The word 一人ひとり is used to emphasize individual contribution and responsibility within a group.
一人ひとりが自分の役割を果たすことが大切だと思います。
I think it's important that each person fulfills their role.
Here, 一人ひとり emphasizes addressing or acknowledging individuals individually rather than collectively.
私は一人ひとりに感謝の気持ちを伝えました。
I conveyed my feelings of gratitude to each person.
In this case, 一人ひとり focuses on valuing individual perspectives within a diverse group.