The ordinal form of the number twenty-eight.

The person or thing in the twenty-eighth position. / One of twenty-eight equal parts of a whole.

The start of the twenty-first hour of the day on the 24-hour clock, i.e. 20:00.

(idiomatic) very fast, fluently

(archaic) Twenty-four. (24)

vicesimo-quarto (as a paper size in printing).

(archaic) Twenty-five.

plural of twenty-second

plural of twenty-first

plural of twenty-seventh