periodically
adv.-
1 at regular intervals (adv.) B2 Upper Intermediate Academichappening repeatedly at set times or after a certain amount of time has passed.
occurring at regular or fixed intervals. This sense often implies a planned or systematic repetition.
ExampleThe security guard checks the back door periodically throughout the night.
ExampleThe software is programmed to back up all active files periodically, ensuring that no more than fifteen minutes of work is ever at risk.
UsageTypically placed after the verb or at the end of a clause to modify the frequency of an action.
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2 from time to time (adv.) B2 Upper Intermediatehappening every now and then, but not necessarily on a strict schedule.
occurring intermittently or from time to time. While similar to 'regularly', this sense can describe less predictable recurrence.
ExampleWe periodically meet for coffee to catch up on each other's lives.
ExampleAlthough they lived in different countries, the sisters periodically exchanged long letters to maintain their close relationship.
UsageOften used at the beginning of a sentence for emphasis or after the main verb.
From periodic + -ally.