Stress is always written and only occurs once per word.

Gentle rains occur once per day allowing some measure of time passing.

These occur once per year and usually run over the weekends.

Snowfall is sporadic, but does occur once or twice per year.

As the celebration only occurs once per month, I never thought that my travel schedule would line up in order to make it.

Roughly two to three meteors occur per hour at its maximum.

The most common description 'white' which occurred in 25 per cent of cases.

New births last year in Russia occurred at the rate of 8.4 per 1,000 people, compared with 13.4 in 1990.

On average, 96 aircraft operations occur per week, with 90% being local general aviation.

A indicates initial reduplication, which can occur only once per word.