What does 外～ mean?
外～ is a Japanese suffix meaning “foreign ~” or “outside ~” in English. It is written as 外～ in kanji, がい～ in hiragana, and gai～ in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
外国語を話す事は容易ではない。
It's not easy to speak a foreign language.