A greeting used when meeting someone for the first time. Typically followed by a self-introduction and 'please treat me well' (よろしくお願いします). Usually written in kana.
はじめまして。田中と申します。どうぞよろしくお願いします。
Nice to meet you. I'm Tanaka. Please take care of me.
会議で初めて会った相手に『はじめまして』と言って名刺を渡した。
I said 'Nice to meet you' and handed my business card to the person I met for the first time at the meeting.
オンラインの自己紹介の冒頭に『はじめまして』と書いた。
I wrote 'Nice to meet you' at the beginning of my online self-introduction.