Question

what is meant by frequency

Answer 1

Frequency. physics. Frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.
but in math it means is
frequency and Frequency Tables. The frequency of a particular data value is the number of times the data value occurs. 

Answer 2

Answer:

The number of complete oscillations made by a simple pendulum in one second is called frequency of the pendulum. Its SI unit is hertz(Hz).