"We do expect the bottom to occur within a reasonably short period ahead," he added.

Frequency refers to how often an event occurs within a period of time.

RecycleMania is a competition among colleges and universities that occurs within a 10-week period of time.

In the second group, the specific regimen strongly implied that healing would occur within a fixed period.

It explains why the megafaunal extinctions occurred within a relatively short period of time.

Death may occur within a period ranging from 15 minutes (this occurred when a small child was bitten) to three days.

These 3 storms were also unique in occurring within a 30-day period.

But he said he expected "the turn to occur within a reasonably short period of time."

"It's just 10 individual killings that happened to occur within a short period of time."

But it was the computer that noticed that these four random deaths occurred within a relatively short period of time.