eighteenth

• 序数词，表示第十八，常用于描述顺序、位置、世纪或事物的排列次序。

An adjective referring to the number 18 in a sequence; often used to describe the position, century, or order of something.

1. Position in sequenceA2formal

   Coming immediately after the seventeenth in a series or order.

   第十八

   • She finished in eighteenth place in the race.
   • The eighteenth chapter of the book is very exciting.
   • His eighteenth birthday was celebrated with a big party.

• 序数词，表示顺序或排名中的第十八位。

A noun referring to the position or rank that is number 18 in a sequential order.

1. Position in a sequenceA2formal

   The position that comes after the seventeenth and before the nineteenth in a series.

   第十八

   • He finished in the eighteenth place in the race.
   • The eighteenth chapter of the book is the most exciting.
   • She was the eighteenth person to arrive at the party.

• 基数词，表示十八个事物、人或计数单位；在许多国家是成年的年龄；也可作名词、限定词或代词使用。

The cardinal numeral representing the quantity of eighteen units; the eighteenth positive integer following seventeen; a composite number (2×3²); culturally significant as the age of legal adulthood in many countries. Also functions as a noun (denoting the symbol, quantity, or group of eighteen), adjective/determiner (modifying nouns to indicate quantity), and pronoun (standing in for a plural noun phrase).

1. Cardinal numeral: the number 18A1formal

   Used to denote a quantity of eighteen persons or things; the eighteenth positive integer in the sequence of natural numbers; a composite number (2×3²); represents an eighteenfold quantity in counting, mathematics, and everyday usage.

   基数词：数字18

   • There are eighteen holes in a standard round of golf.
   • She scored eighteen points in the handball match.
   • Eighteen plus eighteen equals thirty-six.
   • In many countries, you can vote at eighteen.
   • He memorized eighteen new phrases this week.

2. Noun: the number, symbol, or group of eighteenA2formal

   A noun referring to the cardinal number eighteen; the numeral symbol 18 or XVIII; a set, collection, or group consisting of eighteen items; a playing card displaying eighteen (in extended decks); a team or ensemble of eighteen members.

   名词：十八这个数、符号或一组十八个

   • The number eighteen marks the age of legal majority in many jurisdictions.
   • Circle the eighteens in this statistical report.
   • The choir includes a eighteen of vocalists.
   • In some card variants, the eighteen carries special scoring value.
   • The committee consists of a eighteen of appointed members.

3. Adjective/Determiner: amounting to eighteenA1formal

   Used attributively before a noun to indicate that the quantity or number of the noun is eighteen; modifies plural countable nouns to specify exact quantity.

   形容词/限定词：十八的，十八个的

   • They booked an eighteen-week language course.
   • We need eighteen additional microphones for the conference.
   • The experiment requires eighteen milliliters of the reagent.
   • She has eighteen years of experience in software development.
   • Eighteen European cities participated in the sustainability initiative.

4. Pronoun: eighteen people or things (plural)B1formal

   Used as a pronoun to refer to eighteen previously mentioned or understood persons or things; takes plural verb agreement.

   代词：十八个人或事物

   • Eighty applied, but only eighteen were selected for the scholarship.
   • I invited seventy guests; eighteen confirmed their attendance.
   • How many participants do we need? — Eighteen will be ideal.
   • Several firms submitted proposals, but eighteen advanced to the final review.
   • Of the manuscripts evaluated, eighteen were accepted for publication.