frequency (number of occurrences divided by time)

machine; machinery

something that is set one way and will not change; something that is fixed; something that is regular

fixed, settled, certain

oscillation, vibration

oscillate, vibrate

器械: a device, an appliance, a mechanism / 機械: a machine, equipment, an apparatus / 器械: a utensil, a tool, an instrument / 器械: a tool for conducting a test or experiment or for measurement

(weather) the Southern Oscillation

machine translation

(computing) machine learning