frequency / periodicity

• 가다

  –do something while doing something
• 대로

  –A bound noun meaning each time a certain situation or state comes into being, or as often as that
• 마다

  –A postpositional particle that means "once during the previously mentioned period of time."
• 번

  –A bound noun that serves as a unit for counting the frequency of a task
• 주기

  –A bound noun used to count the number of years from a person's death on the anniversary of his/her death