Flow (noun)

1. The continuous movement of a fluid in a certain direction.
2. A steady and continuous movement of something, such as people or traffic.

Origin:

Middle english: from old english flōwian "flow", of germanic origin.

Examples:

1. The flow of water in the river was strong due to recent rain.
2. The flow of traffic was heavy on the highway during rush hour.
3. The flow of people in and out of the building was constant throughout the day.
4. The flow of ideas in the meeting was productive and led to several solutions.
5. The flow of energy in the ecosystem is vital for its continued functioning and balance.