The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18.

(US, military, slang) incorrect; false

The cardinal number occurring after seventy-nine and before eighty-one, represented in Roman numerals as LXXX and in Arabic numerals as 80.

An image or representation of an idea; a representation of an ideal form; an apparition of some actual or imaginary entity, or of some aspect of reality. / A phantom, a ghost or elusive entity.

The cardinal number immediately following twenty-seven and preceding twenty-nine.

A transuranic chemical element (symbol Es) with atomic number 99: a soft, silvery, paramagnetic metal.

The ordinal form of the number eighty-one, describing a person or thing in position number 81 of a sequence.

One of eighty-one equal parts of a whole.

The cardinal number following eighty and preceding eighty-two.

The ordinal form of the number twenty-eight.