1To meet or come across someone or something unexpectedly; to encounter by chance.
旅先で思いがけず高校時代の友人に出会った。
While traveling, I unexpectedly ran into a friend from high school.
この本に出会ったおかげで人生観が変わった。
Encountering this book changed my outlook on life.
二人はコンサート会場で偶然出会った。
The two of them happened to meet at the concert venue.
山道で野生の鹿に出会って驚いた。
I was surprised to encounter a wild deer on the mountain trail.
2For rivers, roads, etc. to meet, join, or intersect.
二つの川がこの町で出会い、一つの大きな流れになる。
Two rivers meet in this town and become one large stream.
旧道と新しい高速道路がこの先で出会う。
The old road meets the new highway a little further ahead.
3To emerge and confront an enemy in battle, often used in the imperative 出会え.
「出会え、出会え！」と叫び、兵士たちが敵を迎え撃った。
Shouting 'To arms, to arms!', the soldiers moved to engage the enemy.