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

plural of eighty

The decade of the 1880s, 1980s, etc. / The decade of one's life from age 80 through age 89. / (temperature, rates, plural only) The range between 80 and 89.

From or evoking the 81st through 90th years of a century (chiefly the 1980s).

The ordinal form of the number eighty-two, describing a person or thing in position number 82 of a sequence.

One of eighty-two equal parts of a whole.

One of eighty-nine equal parts of a whole.

The ordinal form of the number eighty-nine, describing a person or thing in position number 89 of a sequence.

The ordinal form of the number eighty-five, describing a person or thing in position number 85 of a sequence.

One of eighty-five equal parts of a whole.