1. Bicentennial - a period of 200 years 2. centennial - a period of 100 years 3. century - 100 years 4. Quadricentennial - a period of 400 years 5. Quincentennial - a period of 500 years
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6. Decennial - a period of 10 years 7. Quadrennial - every 4 years 8. biennial - a period of 2 years 9. Septennial - a period of 7 years 10. Sexennial - a period of 6 years
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11. Triennial - every 3 years 12. Vicennial - every 20 years 13. Perennial - lasting throughout the year 14. Diurnal - occuring daily 15. Semi - diurnal - occuring twice a day
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16. Millenium - a period of 1000 years 17. month - a period of 28 to 31 days 18. Olympiad - every 4 years 19. Decade - 10 years 20. Sexcentenary - period of 600 years
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21. Tercentenary - pereiod of 300 years 22. Week - period of 7 days 23. Year - 365 days 24. Leap year - 366 days 25. annual - occuring every year
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26. Biannual - occuring twice a year 27. Bimonthly - Occuring twice a month 28. Biweekly - every 2 weeks / twice a week 29. Semi-annual - twice a year 30. Semi weekly - twice a week
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31. Weekly - once a week 32. Monthly - Once a month 33. Fortnightly - once every 15 days or twice a month 34. Tri-monthly - every 3 months 35. Tri-weekly - every 3 weeks or thrice a week
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36. day - a period of 24 hours 37. Hour - a period of 60 minutes 38. Minute- a period of 60 seconds 39. Morning - the part of the day from sunrise till noon 40. Afternoon - the part of the day from noon to evening
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41. Evening - the part of the day from afternoon to night 42. Night - the part of the day from sunset to sunrise43. Midnight - the middle of the night 44. dawn - the time when daybreaks and sunlight appears 45. Dusk - the time when day changes into night and the sky starts getting dark