18th

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Definitions from WordNet

Adjective 18th has 1 sense

eighteenth, 18th - coming next after the seventeenth in position
Antonym: cardinal (indirect, via ordinal)

Definitions from the Web

Term: 18th

Part of Speech: Adjective

Sense 1: Relating to or characteristic of the period or days immediately preceding and following the 18th century.

Example Sentence: The 18th century witnessed significant advancements in science and Enlightenment thinking.

Sense 2: Representing the ordinal number eighteen in a series.

Example Sentence: She was celebrating her 18th birthday with a grand party.

Part of Speech: Noun

Sense: The rank or position of a person in a series counting from eighteen.

Example Sentence: He finished in 18th place in the race.

Part of Speech: Abbreviation

Sense: Referring to the 18th amendment of the United States Constitution which prohibited the manufacturing, sale, or transportation of alcoholic beverages.

Example Sentence: The 18th amendment led to the era of Prohibition in the early 20th century.