n

n — 名詞

1. the fourteenth alphabet letter in English, which can be written in its capital s

1.名詞A1
釋義

字母 n

英文字母表中的第十四個字母

the fourteenth alphabet letter in English, which can be written in its capital shape (N) or its small shape (n), and which usually stands for a nasal sound made by pushing breath out through the nose.

例句

The young pupil practised writing a neat capital N in her notebook.

那位年幼的學生在筆記本上練習寫一個工整的大寫 N。

capital N as the written shape of the letter

Maeve forgot to add the second n when she spelled the word 'connect'.

Maeve 在拼「connect」這個字時忘了加上第二個 n。

double n inside a common English word

同義詞

文法句型

the letter n

capital N / small n

用法筆記

Often referred to as 'the letter N', and the plural form is usually written 'n's' or 'N's' with an apostrophe to avoid confusion (e.g. 'There are two n's in winner.'). The letter usually stands for a nasal sound, except when it is silent after the letter m, as in 'autumn' or 'column'.

常見錯誤

There are two ns in winner.
There are two n's in winner.
💡use an apostrophe in the plural of a letter to keep it readable.

2. a written short form for the direction 'north', used on maps, road signs, weathe

2.名詞B1
釋義

北方縮寫

在地圖或地址上代表「北方」的縮寫

a written short form for the direction 'north', used on maps, road signs, weather reports, and address labels to save space.

例句

The road sign showed N for the way to the airport in the next town.

那個路標用 N 指出通往下一個鎮上機場的方向。

N on a road sign meaning the direction north

Amelia lives at 25 Park Road N, just behind the old library.

Amelia 住在 Park Road N 25 號,就在那間老舊圖書館的後面。

N at the end of a street name as a short form of North

同義詞
  • North

    the full spelled-out form used in everyday speech and writing

反義詞
  • S

    written short form for 'south', the opposite direction

文法句型

N as an abbreviation in addresses or weather reports

用法筆記

Almost only seen in writing, especially in addresses, maps, signs, and weather forecasts. When people speak, they normally say the full word 'north' instead of 'N'. Distinguish from sense 1, which names the alphabet letter itself rather than the direction.

常見錯誤

We drove n for two hours.
We drove north for two hours.
💡in normal speech and writing, use the full word 'north', not the letter N.

3. in a maths problem or formula, a letter that takes the place of any whole number

3.名詞B1
釋義

未知數

數學中代表未指定整數的符號

in a maths problem or formula, a letter that takes the place of any whole number whose exact size has not yet been chosen, often standing for how many items there are or for the position of an item in a list.

例句

The teacher wrote 'let n equal the number of pupils in the room' on the board.

老師在黑板上寫下「設 n 等於教室裡的學生人數」。

let n = a particular value when starting a maths problem

Darius wrote a short formula that worked for any whole number n.

Darius 寫了一個對任何整數 n 都成立的簡短公式。

n stands for any whole number in a general formula

同義詞
  • variable

    the general maths term for any letter that stands for a number

  • x

    another common letter used for an unknown, but more often for general numbers than for whole numbers

文法句型

let n = ...

n + 1, n − 1

for any n

用法筆記

Usually written in italics in textbooks (n), and almost always paired with whole numbers. The choice of the letter n is a convention; mathematicians often pick n, m, or k for whole-number variables and x or y for general numbers.

4. an informal way of writing some unspecified amount or count, most often in the f

4.名詞B2
釋義

若干;無數

口語表示不確定但很多的次數

an informal way of writing some unspecified amount or count, most often in the fixed phrase 'for the n-th time' to mean 'after many earlier times'.

例句

Ravindra reminded the children for the n-th time to put their shoes by the door.

Ravindra 已經提醒孩子們第 n 次要把鞋子放在門邊。

for the n-th time meaning 'after many reminders'

The film has been shown on television n times since it came out in 1995.

自從 1995 年上映以來,那部電影已經在電視上播過 n 次了。

n times standing in for an uncountably large number

同義詞
  • umpteenth

    very informal alternative meaning 'one of many times' — slightly more spoken than 'n-th'

  • countless

    stronger word meaning 'too many to count', and used as a normal adjective

文法句型

n times

n hours / n days

用法筆記

This use grew out of the maths sense but is now spoken or written without any real number in mind. The phrase 'for the n-th time' is by far the most common pattern; outside of that, 'n' as a vague amount is rare.

常見錯誤

I have told you for the n times to be careful.
I have told you for the n-th time to be careful.
💡the fixed phrase keeps the form 'n-th', with a hyphen and the ending 'th'.

5. a written short form for the grammar word 'noun', used in dictionaries and gramm

5.名詞B1
釋義

名詞縮寫

字典裡用來標示「名詞」的縮寫

a written short form for the grammar word 'noun', used in dictionaries and grammar lists to label words that name people, places, or things.

例句

Next to the word 'table' the dictionary printed a small n., meaning it is a noun.

字典在「table」這個字旁邊印了一個小小的 n.,表示它是名詞。

n. printed after a word to mark its grammar class

Élise highlighted every n. in her vocabulary list to focus on naming words first.

Élise 在單字表上把每一個 n. 都用螢光筆標起來,先專心記住名詞。

using n. in a study list to pick out nouns

同義詞
  • noun

    the full spelled-out word used in speaking and in running text

文法句型

n. after a word in a dictionary entry

用法筆記

Almost only seen in dictionaries, grammar exercises, and word lists, where it is often followed by a full stop ('n.'). Speakers never say 'n' aloud here — they say the full word 'noun' instead.

6. the capital-letter mark used in chemistry to stand for the gas nitrogen, which m

6.名詞B2
釋義

氮元素符號

化學中代表氮這種氣體的字母符號

the capital-letter mark used in chemistry to stand for the gas nitrogen, which makes up about four-fifths of the air around us.

例句

The chemistry teacher wrote N₂ on the board to show that nitrogen comes in pairs.

化學老師在黑板上寫下 N₂,說明氮氣是以成對的形式存在。

N₂ as the standard chemistry mark for nitrogen gas

Ammonia has the formula NH₃, where N stands for nitrogen and H for hydrogen.

氨的化學式是 NH₃,其中 N 代表氮,H 代表氫。

N inside a chemical formula such as NH₃

同義詞
  • nitrogen

    the full English name for the gas; used in running text rather than in formulas

文法句型

N in a chemical formula such as NH3, N2

用法筆記

Always written as a capital N in chemistry, since lower-case letters in formulas mean something different. Most often seen on plant-food packets (N for nitrogen, P for phosphorus, K for potassium) and in school chemistry formulas.

常見錯誤

The bag of fertiliser has n and p.
The bag of fertiliser has N and P.
💡chemistry symbols are always written with a capital letter, even in informal writing.

n — 形容詞

n — 連接詞

n — 縮寫