To match or be similar to something. It also means to exchange letters, emails, or messages with someone over a period of time.
From Medieval Latin *correspondere* 'to answer together, be in agreement', from *com-* 'together' and *respondere* 'to answer'. It entered English through French.
Two things 'correspond' when they answer to each other—like matching keys and locks, or maps and real places. Before email, to correspond with someone meant building a relationship through long, thoughtful letters. The word still carries a hint of that slow, careful communication.
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