undecennary

As a noun terms

is .

As an adjective undecennary is

once every eleven years; undecennial.

As adjectives the difference between undecennial and undecennary

is that undecennial is occurring or observed every eleventh year while undecennary is once every eleven years; undecennial.

As a noun year

is the time it takes the earth to complete one revolution of the sun (between 36524 and 36526 days depending on the point of reference).

As an adjective undecennary is

once every eleven years; undecennial.

As a numeral eleven

is the cardinal number occurring after ten and before twelve. Represented as 11 in Arabic digits.

As a noun eleven

is a cricket team of eleven players.

As an adjective undecennary is

once every eleven years; undecennial.