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/ˈeɪ(t).tin/ · numeral
The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18..
The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.
Use eighteen when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Eighteen means The cardinal number occurring after seventeen and before nineteen, represented in Roman numerals as XVIII and in Arabic numerals as 18..
Common synonyms include cardinal, 18, xviii.
The opposite depends on the specific sense.
The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.
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