Similar words
encuentro
encuentro is more casual or informal, like an encounter or a sports match; reunión is more formal, like a scheduled business meeting.
Similar in other languages
French
réunion
réunion is the French word for the same thing — both mean "meeting."
Portuguese
reunião
reunião is the Portuguese word for the same thing — both mean "meeting."
Practice
1 What does reunión mean?
meeting
2 Fill the gap: Tengo una ___ a las diez.
Full sentence: Tengo una reunión a las diez. (I have a meeting at ten.)
3 Which fingerprint chart matches reunión?
reunión: neutral register, core frequency, general domain, neutral connotation.