The Vietnamese word "tiệc" is a noun that translates to "banquet," "party," or "feast" in English. It refers to a gathering of people for a special event, usually involving food and drinks.
Tiệc sinh nhật - Birthday party
Tiệc cưới - Wedding banquet
Tiệc tất niên - Year-end party
While "tiệc" primarily refers to a party or banquet, it can also imply any gathering that involves food and social interaction.