I go to the gym once a week.
once a
idiomA phrase used to say how often something happens. You complete it with a period of time, like 'once a week' or 'once a month', to mean one time during that period.
My parents live in another city, so I visit them once a month.
The committee meets once a year to review the budget and plan for the upcoming season.
Last updated April 22, 2026