prep.preposition
1. Within the limits, bounds, or area of.
was hit in the face; born in the spring; a chair in the garden.
2. From the outside to a point within; into.
threw the letter in the wastebasket.
3. To or at a situation or condition of.
was split in two; in debt; a woman in love.
4. Having the activity, occupation, or function of.
a life in politics; the officer in command.
5. During the act or process of.
tripped in racing for the bus.
I can see what you’re in to AJ, I guess when you can make wikipedia.org you can Etymology here
The paper boy is in route to deliver you the early morning news.