1. people who exchange letters regularly, typically without having met in person
Usage: plural form; also used in singular as 'penfriend'; common in British English; American English often uses 'pen pal'

Examples

• She has penfriends in five different countries.
• My daughter made penfriends through a school exchange program.
• They became penfriends after meeting at an international youth conference.
• Writing to penfriends helped her improve her French.
• The organization connects young people with penfriends around the world.
• He has maintained friendships with his penfriends for over ten years.