functioning

/ˈfʌŋkʃənɪŋ/
adjective
  1. Working or operating correctly; able to perform its normal purpose.
    • After the storm, only one of the three traffic lights was functioning.
    • The old radio is still functioning, even though it was made in the 1950s.
    • We need a functioning smoke detector in every room of the house.
noun
  1. The action or process of working or operating.
    • Good communication is essential for the functioning of any team.
    • The smooth functioning of the engine depends on regular oil changes.
    • The doctor checked the functioning of the patient's kidneys.