millennium

As a noun millennium is

millennium (thousand-year period).

Milenium is often a misspelling of millennium.

Milenium has no English definition.

As a noun millennium

is a period of time consisting of one thousand years.

As nouns the difference between perennial and millennium

is that perennial is a perennial plant; a plant that is active throughout the year or survives for more than two growing seasons compare (annual), (biennial) while millennium is millennium (thousand-year period).

As an adjective perennial

is lasting or remaining active throughout the year, or all the time.

Goldenage is likely misspelled.

Goldenage has no English definition.

As a noun millennium

is a period of time consisting of one thousand years.

As nouns the difference between taxonomy and millennium

is that taxonomy is the science or the technique used to make a classification while millennium is millennium (thousand-year period).

As nouns the difference between millennium and millenium

is that millennium is a period of time consisting of one thousand years while millenium is misspelling of lang=en.

As a noun millennium is

millennium (thousand-year period).

As nouns the difference between millennium and thamud

is that millennium is a period of time consisting of one thousand years while Thamud is a member of a people of ancient Arabia, known from the first millennium (BCE) to near the time of Muhammad, and according to the Qur'an punished and destroyed by an earthquake.

As a noun millennium

is millennium (thousand-year period).

As an adjective postmillennium is

after the turn of the millennium.

As a noun millennium

is a period of time consisting of one thousand years.

As an adjective millenary is

of or pertaining to a thousand, especially to a thousand years.