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once a year vs once per year

Both 'once a year' and 'once per year' are correct and commonly used phrases in English. They are interchangeable and convey the same meaning.

Last updated: March 26, 2024 • 9455 views

once a year

This phrase is correct and commonly used in English.

This phrase means something that happens one time in a year. It is a common expression to indicate the frequency of an event happening annually.

Examples:

  • I go on vacation once a year.
  • The festival is held once a year.
  • We have a family reunion once a year.
  • The company conducts performance reviews once a year.
  • The flowers bloom once a year.
  • At least once a year for syphilis, chlamydia, and gonorrhea. Those who have multiple or anonymous partners should be tested more frequently (e.g., ...
  • It's important to do this at least once a year. Be sure to check before you apply for credit, a loan, insurance, or a job. If you find mistakes on your ...
  • As part of a complete skin cancer early detection strategy, visit a dermatologist once a year for a full-body, professional skin exam.
  • Every restaurant in New York City is scheduled for an unannounced inspection at least once a year. During the inspection, an inspector checks for compliance ...
  • Test your well water at least once a year for bacteria and for other contaminants every 3-5 years. Test your water for E. coli and coliform bacteria after ...
  • Feb 22, 2022 ... If your alarms use regular batteries, swap in fresh batteries at least once a year. A “chirping” sound means that it's time to change ...

Alternatives:

  • annually
  • every year
  • yearly
  • once annually
  • once every year

once per year

This phrase is correct and commonly used in English.

This phrase also means something that happens one time in a year. It is a formal way to express the frequency of an event occurring annually.

Examples:

  • The report is submitted once per year.
  • The subscription fee is paid once per year.
  • The medical check-up is done once per year.
  • The event is organized once per year.
  • The maintenance is scheduled once per year.
  • The frequency proposed is once per year.
  • It shall meet at least once per year.
  • Sensory checks on the organoleptic characteristics are as a rule made once per year.
  • The competent authority shall monitor at least once per year that the threshold defined in the first subparagraph is respected and report its findings to ESMA.
  • That ratio shall be updated at least once per year applying industry best practice guidelines.
  • The control referred to in point (d) shall take place at least once per year.
  • Compliance with the reproducibility limit must be checked at least once per year using the procedure described in Annex III(a).
  • It shall meet at least once per year in the presence of a representative of the Commission.
  • Competent bodies from all Member States shall meet, at least once per year in the presence of a representative of the Commission.
  • It shall meet at least once per year in the presence of a representative of the Commission.
  • For combustion plants firing coal or lignite, the emissions of total mercury shall be measured at least once per year.
  • The automated measuring systems shall be subject to control by means of parallel measurements with the reference methods at least once per year.
  • The degree of calcination and composition shall be determined at least once per year following the provisions of Section 13 of Annex I.
  • The frequency of monitoring shall be no less than once per year.
  • Changes of restructuring programmes, as referred in Article 4(3) of Regulation (EC) No 637/2008, shall not be submitted more than once per year.
  • Each undertaking in receipt of an authorisation shall be checked at least once per year.
  • Adult sheep and goats of wool breeds should be shorn at least once per year, unless this would compromise their welfare.
  • It shall meet at the invitation of the Chair not less than once per year.
  • Where applicable, a test must be organised at least once per year to compare the results obtained by assessors from different regions.
  • The compliance of the calibrator with the requirements of EN 60942:1998 shall be checked once per year.

Alternatives:

  • annually
  • every year
  • yearly
  • once annually
  • once every year

Related Comparisons

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