noun, adverb
on the way; en route
Refers to being in the course of moving from one place to another, or during a journey. Often used with verbs of movement or stopping.
学校へ行く途中で友達に会った。
I met a friend on the way to school.
帰宅の途中、スーパーに
On the way home, I stopped by the supermarket.
noun, adverb
in the middle of; midway; halfway
Indicates being partway through an action, process, or state, not yet finished. Common with nouns like 仕事, 会議, 食事, or verbs in ている form.
食事の途中で電話が鳴った。
The phone rang in the middle of the meal.
まだ工事の途中です。
It's still in the middle of construction.