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to put in; to insert; to include; to add
書類をファイルにいれる
to put documents in a file
人をチームにいれる
to add someone to a team
to accept; to admit; to take in
人を家にいれる
to let someone in the house
学生を受けいれる
to accept a student
The verb いれる is often used in formal situations, such as in business or official settings.