1. plural of eighteenth; the ordinal number matching the position 18 in a series, or one of 18 equal parts of a whole

1. relating to or denoting the ordinal number 18 in a series; coming after the seventeenth

Examples

• The eighteenths of the pie were distributed equally among the guests.
• She finished in the eighteenths position in the race.
• The eighteenths notes in the musical score are played quickly.
• He lives on the eighteenths floor of the building.
• The recipe calls for three-eighteenths of a cup of sugar.
• The eighteenths chapter of the book contains the climax.