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I; me
personal (affairs, etc.); private
selfishness; partiality
secrecy; confidentiality
「私」 has other readings with different meanings.
わたくしが責任を持ちます。
I will take responsibility.
わたくしどもの会社をご紹介します。
Allow me to introduce our company.
わたくしの不手際でご迷惑をおかけして申し訳ございません。
I sincerely apologize for the inconvenience caused by my mistake.