n. 频率(频繁)

[ noun ]
the number of occurrences within a given time period
<noun.time>
the frequency of modulation was 40 cycles per secondthe frequency of his seizures increased as he grew older

Frequence \Fre"quence\, n. [See {Frequency}.]
1. A crowd; a throng; a concourse. [Archaic.] --Tennyson.

2. Frequency; abundance. [R.] --Bp. Hall.