adj
periodic
pih-ree-O-dihk
adj
1
Happening again and again at regular intervals.
"The machine needs periodic maintenance to keep running smoothly."
"Periodic flooding is common along this stretch of river."
How to Use Periodic
Learner’s notesIn plain EnglishRecurring regularly, at set intervals rather than constantly or just once.
Common mistake
Periodic means "at intervals," not just "occasional" — something periodic is expected to keep recurring on a schedule.
Common pairings
periodic review
periodic table
periodic checkup
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The machine needs _____ maintenance to keep running smoothly.
Etymology
From French périodique, ultimately from Greek periodos ("cycle").