x

/eks/ (bre, ipa) · [ˈɛks] /eks/ (ame, ipa)

x — 名詞

1. the character 'x' occupies the twenty-fourth position in the ABCs and can be wri

1.名詞A1
釋義

X 字母

英文字母第24個字母

the character 'x' occupies the twenty-fourth position in the ABCs and can be written as a small 'x' or a big 'X'

例句

In the alphabet, X is the third-to-last letter, coming just before Y and Z.

在字母表中，X 是倒數第三個字母，排在 Y 和 Z 的前面。

The teacher asked the children to write the letter 'X' ten times.

老師要小朋友把字母 X 抄寫十次。

capital X vs lowercase x

文法句型

x / X (lowercase / capital)

常見錯誤

❌I wrote the multiplication sign as letter x.
✅I wrote the multiplication sign as a cross symbol (×).
💡The letter X is different from the multiplication sign (×), though they look similar.
❌Please sign your name with a big x.
✅Please sign your name with a big X.
💡When referring to the letter itself, use a capital X in formal contexts.

2. the Roman numeral that stands for the number 10, used on clocks, in outlines, an

2.名詞A2
釋義

十

羅馬數字中的10

the Roman numeral that stands for the number 10, used on clocks, in outlines, and in the names of rulers or chapters

例句

King Louis X of France reigned from 1314 to 1316.

法國國王路易十世在位期間為 1314 年至 1316 年。

The clock tower showed the Roman numeral X to mark ten o'clock.

那座鐘樓以羅馬數字 X 來標示十點鐘的位置。

Roman numeral X on clocks

同義詞
  • ten

    the Arabic numeral equivalent; 'ten' is the everyday word, X is formal or decorative

文法句型

X as Roman numeral

用法筆記

Written as a capital X. Distinguish from numeral sense 1 (LETTER OF ALPHABET) which can be either case.

常見錯誤

❌We met at Chapter x, page 20.
✅We met at Chapter X, page 20.
💡Roman numerals are always written in capitals.

3. a mark shaped like an X that voters make on a ballot paper to show which candida

3.名詞A2
釋義

投票記號

投票時標示選擇的記號

a mark shaped like an X that voters make on a ballot paper to show which candidate or choice they support

例句

Padma put an X next to the candidate she wanted to win.

Padma 在她支持的候選人旁邊畫了一個 X。

On election day, voters must mark an X beside one name only.

選舉當天，選民只能在一個名字旁邊畫 X。

mark an X beside [name]

同義詞
  • cross

    an X-shaped mark in general; 'cross' is used in other contexts like ticking boxes on forms

文法句型

put / mark an X next to [candidate]

用法筆記

Common in paper-ballot election systems. In many countries, a ✓ (tick/check mark) is used instead of an X.

常見錯誤

❌I voted by circling the number.
✅I voted by marking an X next to the name.
💡In many voting systems, the X mark is the standard way to show your choice, not a circle.

4. a symbol used in mathematics and science to stand for an unknown number, quantit

4.名詞A2
釋義

未知數

代表未知數量的符號

a symbol used in mathematics and science to stand for an unknown number, quantity, or value that can be calculated

例句

In the equation 2x + 3 = 11, the letter x stands for the missing number.

在方程式 2x + 3 = 11 中，字母 x 代表未知的數字。

solve for x in equations

The science teacher wrote 'solve for x' on the classroom board.

自然科老師在黑板上寫了「求 x 的值」。

同義詞
  • variable

    a broader term; any symbol that can take different values, not just x

  • unknown

    used as a noun (e.g., 'the unknown in this equation'); slightly more formal

反義詞

文法句型

solve for x

let x equal [number]

x represents [quantity]

用法筆記

Beyond mathematics, X can also represent an unnamed person or thing (e.g., 'Mr. X', 'Brand X'). In algebra the letter is always lowercase x; in the unnamed-person usage it is capitalised.

常見錯誤

❌If we solve for X the answer is four.
✅If we solve for x, the answer is four.
💡In algebra equations, use lowercase x as the variable.
❌The test result had x beside it.
✅The test score was recorded as an unknown, marked X.
💡The mathematical X is different from the wrong-answer mark X in sense 6.

5. people write the letter X in personal messages, cards, or handwritten notes as a

5.名詞A1
釋義

親吻

信件結尾表示親吻的符號

people write the letter X in personal messages, cards, or handwritten notes as a way of sending a kiss, to show warm feelings toward the reader

例句

Aylin ended her letter with lots of Xs and Os for love and hugs.

Aylin 在信的結尾寫了好多 X 和 O，代表親吻和擁抱。

Xs and Os = kisses and hugs

The birthday card from Grandma was signed 'Love, Grandma XXX' at the bottom.

奶奶寄來的生日卡片下方署名「愛你的奶奶 XXX」。

文法句型

X / XX / XXX at end of message

用法筆記

Very common in British English informal writing; less common in American English. The number of Xs can indicate the strength of affection — one X is friendly, multiple Xs are warmer.

常見錯誤

❌I put a X at the end of my email to my boss.
✅I put an X at the end of my text to my best friend.
💡The X kiss symbol is only suitable for informal, personal messages, not professional emails.
❌In Taiwan, people also end letters with X.
✅Ending messages with X is common in the UK but less common in Taiwan.
💡Learners should know this is a cultural practice, not universal.

6. a mark shaped like an X made by a teacher next to an answer on a test or homewor

6.名詞A1
釋義

錯誤記號

批改時標示答案錯誤的記號

a mark shaped like an X made by a teacher next to an answer on a test or homework to show that it is not correct

例句

The teacher put a red X next to every incorrect answer on the test.

老師在考試卷上每道錯誤答案旁邊都畫了一個紅色的 X。

red X for incorrect answers

Bao saw an X on his math homework and knew he had made a mistake.

Bao 看到數學作業上有一個 X，就知道自己寫錯了。

同義詞
  • cross

    another word for an X-shaped mark; 'cross' is less specific to grading

反義詞
  • tick

    a check mark (✓) used to show a correct answer

  • check mark

    the correct-answer symbol in many English-speaking countries

文法句型

put / draw an X next to [answer]

用法筆記

The opposite of this mark is a ✓ (tick or check mark), which shows a correct answer. In many East Asian classrooms a small circle ○ is used instead of a ✓ for correct answers.

常見錯誤

❌The teacher gave me an X for the correct answer.
✅The teacher gave me an X for the wrong answer.
💡An X means the answer is incorrect, not correct.

x — 形容詞

x — 動詞