What does 達 mean?
達 is a Japanese suffix meaning “pluralizing suffix (esp. for people and animals; formerly honorific)” in English. It is written as 達 in kanji, たち in hiragana, and tachi in romaji. This word is part of JLPT N5 vocabulary.
Example sentence
１０人の囚人たちが脱獄した。
Ten prisoners broke out of jail.