The meaning of Architecture is not limited to solid buildings. The following 3 points are necessary elements that form the spirit of architecture in my mind.
Historical architecture stands for hundreds or even thousand of years. It has participated in era changes, where cultures and generation altered. Therefore, architecture has the ability to contain space as well as time.
Boundaries define spaces of different functions. Yet architecture should serve as the connection, instead of isolating users from the environments.
Entries, exits, and even boundaries affect traffic flows. Architecture creates specific atmosphere and arouse activities happen. People interact with each other; humans interact with surroundings.