1. the rates at which something occurs or is repeated over a particular period of time
Usage: plural of frequency
2. the number of cycles per second of a sound wave, radio wave, or other wave
Usage: physics; technical

Examples

• The doctor monitored the frequencies of the patient’s symptoms.
• Radio stations broadcast on different frequencies to avoid interference.
• The frequencies of earthquakes in this region have increased recently.
• Sound frequencies above 20,000 Hz are inaudible to most humans.
• The study analyzed the frequencies of various bird calls.
• Different radio frequencies are assigned to emergency services.
• The frequencies of these events seem to follow a pattern.