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Important notice

Good news! We have updated our writing tools. Writing Tips and The Canadian Style have been combined to create a new tool called Writing Tips Plus.

Don’t forget to update your bookmarks. Within a few weeks, Writing Tips will no longer be available.

To begin your search, go to the alphabetical index below and click on the first letter of the word you are searching for.

period of time, time period

Period of time and time period are idiomatic expressions.

  • The auditor examined the company’s receipts and expenditures over a lengthy period of time.
  • This introductory course examines European history by time period.

However, where possible, write concisely by replacing these phrases with period or time.

  • The geologist studied the period between the last two ice ages.
  • The change of seasons divides the year into four periods (not time periods).
  • The Depression was a very difficult time (or period) for many people.