- The definition of a break in is an illegal entry into a house, building or vehicle.
An example of a break in is a robbery of a store.
- A break in is defined as the first usage or experience with something.
An example of break in is the first month of driving a new car.
This forcible entry to this house is a break-in.
- A forcible entry, as into a building or room, for an illegal purpose, especially theft.
- An initial period of employment or operation during which the performance of a person or thing may be evaluated and adjusted.