1 rate at which sth happens
ADJ. great | increased, increasing | relative The relative frequency of this illness in the area is of concern to all doctors. | alarming Bullets bounced off the rock with alarming frequency.
VERB + FREQUENCY decrease in, increase in Crime increases in frequency in less settled neighbourhoods. | decrease, increase, reduce The drug can reduce the frequency and severity of attacks.
PREP. with ~ Accidents of this sort are happening with increasing frequency.
2 of a wave
ADJ. high, low | ultrasonic | microwave, radio, television, vibration, wave | signal
FREQUENCY + NOUN range | band