anniversary

As nouns the difference between anniversary and octocentenary

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event while octocentenary is an eight-hundredth anniversary.

As nouns the difference between anniversary and septcentenary

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event while septcentenary is a seven hundred year anniversary.

As nouns the difference between anniversary and bimillenary

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event while bimillenary is a two-thousandth anniversary.

As an adjective bimillenary is

of or pertaining to two thousand.

As nouns the difference between anniversary and mensiversary

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred. Often preceded by an ordinal number indicating the number of years that have elapsed since the event while mensiversary is a day that is an exact month (or specified number of months) since the occurrence of a significant event.

As nouns the difference between anniversary and sexcentenary

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event while sexcentenary is a six-hundredth anniversary.

As an adjective sexcentenary is

of or pertaining to the number six hundred, or to a six hundred year period.

As nouns the difference between anniversary and yeartide

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred. Often preceded by an ordinal number indicating the number of years that have elapsed since the event while yeartide is a specific time of year; season.

As nouns the difference between anniversary and quincentenary

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event while quincentenary is a five-hundredth anniversary.

As an adjective quincentenary is

pertaining to a quincentenary; quincentennial.