alphabet, letter, character, script

letter, note, correspondence, message

名詞 letter:

1. a written message addressed to a person or organization
   同義詞：missive
2. the conventional characters of the alphabet used to represent speech
   同義詞：letter of the alphabet, alphabetic character
3. a strictly literal interpretation (as distinct from the intention)
4. an award earned by participation in a school sport
   同義詞：varsity letter
5. owner who lets another person use something (housing usually) for hire

動詞 letter:

1. win an athletic letter
2. set down or print with letters
3. mark letters on or mark with letters

1. There was nothing in the letter of particular importance.
   這封信里沒有什么特別重要的事。
2. There are two collections a day from this letter box.
   這個郵箱每天開兩次。
3. Put this letter in the main file.
   把這封信放在主要文件夾中。
4. Have you answered her letter?
   你給她回信了嗎？
5. This word has five letters.
   這個單詞有五個字母。

let.ter

n.（名詞）
A written symbol or character representing a speech sound and being a component of an alphabet.
字母：一種書寫符號或代表一個語音的特征，是字母表的組成部分
A written or printed communication directed to a person or an organization.
信：發(fā)給某人或某種組織的書寫或打印的通訊
Often letters A certified document granting rights to its bearer.
常作 letters 許可證：證明持有者某些權(quán)力的證明文件
Literal meaning:
字面意思：
例句：
had to adhere to the letter of the law.
必須恪守法律的字面意思

letters (used with a sing. verb)
letters （與單數(shù)動詞連用）
Literary culture; belles-lettres.
文學(xué)；純文學(xué)
Learning or knowledge, especially of literature.
文學(xué)知識：尤指文學(xué)方面的學(xué)問或知識
Literature or writing as a profession.
文學(xué)家，作家
Printing
【印刷術(shù)】
A piece of type that prints a single character.
（一個）鉛字：印刷某一個字的鉛字
A specific style of type.
字形：鉛字的某種特定印刷體例
The characters in one style of type.
鉛字字體：鉛字某種印刷體例中的字符
An emblem in the shape of the initial of a school awarded for outstanding performance, especially in varsity athletics.
校名字首形式的徽章：以學(xué)校名字首字母的形狀制成的徽章，獎給那些表現(xiàn)優(yōu)異的人，尤指那些大學(xué)體育競賽中表現(xiàn)優(yōu)異者
v.（動詞）
let.tered,let.ter.ing,let.ters
v.tr.（及物動詞）
To write letters on.
寫上字
To write in letters.
以文字寫上
v.intr.（不及物動詞）
To write or form letters.
寫字，造字
To earn a school letter, as for outstanding athletic achievement:
獲得校名字母徽章：贏得學(xué)校名字母縮寫徽章，如因取得體育競賽優(yōu)異成績者：
例句：
She lettered in three collegiate sports.
她在三次大學(xué)生體育競賽中獲得校名字母徽章

<習(xí)慣用語>to the letter
To the last detail; exactly:
嚴格按照文字；精確地：
例句：
followed instructions to the letter.
不折不扣地遵照指示

來源：
Middle English
中古英語
from Old French lettre
源自 古法語 lettre
from Latin littera
源自 拉丁語 littera
perhaps from Etruscan
可能源自 伊特魯里亞語
from Greek diphthera [hide, leather, writing surface]
源自 希臘語 diphthera [獸皮，皮革，書寫表面]

【引伸】
let.terer
n.（名詞）
<參考詞匯><同義詞>letter,epistle,missive,noteThe central meaning shared by these nouns is .a written communication directed to another.:
這些名詞共有的中心意思是指.發(fā)給別人的一種書面交流形式.：
例句：
received a letter of complaint;
收到一封投拆信；

例句：
the Epistles of the New Testament;
新約圣經(jīng)的使徒書信；

例句：
a missive of condolence;
慰問公函；

例句：
a thank-you note.
致謝信