octennial

is likely misspelled.

has no English definition.

As an adjective octennial

is occurring every eight years.

As a noun terms

is .

As an adjective octennial is

occurring every eight years.

As an adjective octennial

is occurring every eight years.

As a noun octennia is

.

As a noun taxonomy

is the science or the technique used to make a classification.

As an adjective octennial is

occurring every eight years.

Octennial is a related term of octaeteris.

As an adjective octennial

is occurring every eight years.

As a noun octaeteris is

an octennium, a period of eight (8) years (chiefly) in the ancient greek calendar or in reference to the short lunisolar cycle.

Octennial is a derived term of octennially.

As an adverb octennially

is every eight years.

As an adjective octennial is

occurring every eight years.

Octennial is a related term of year.

As a noun year

is the time it takes the Earth to complete one revolution of the Sun (between 365.24 and 365.26 days depending on the point of reference).

As an adjective octennial is

occurring every eight years.

As a numeral eight

is (cardinal) a numerical value equal to ; the number occurring after seven and before nine.

As a noun eight

is the digit/figure 8 or eight can be an island in a river; an ait.

As an adjective octennial is

occurring every eight years.