Definitions from Unihan Copyright © 1991-2015 Unicode® Inc. All rights reserved.

from CC-CEDICT under a Creative Commons Attribution-Share Alike 3.0 License

信' + 信 * * + letter / mail CL:封
信件' + 信件 * * + letter (sent by mail)/
信函' + 信函 * * + letter / mailbox
信札' + 信札 * * + letter /
信用證' + 信用证 * * + letter of credit /
信箋' + 信笺 * * + letter / letter paper
函件' + 函件 * * + letters / correspondence
委任書' + 委任书 * * + letter of appointment /
字' + 字 * * + letter / symbol character
字母' + 字母 * * + letter (of the alphabet)/ CL:個|个
字詞' + 字词 * * + letters or words / words or phrase
字謎' + 字谜 * * + letter puzzle /
家信' + 家信 * * + letter (to or from) home /
快信' + 快信 * * + letter by express mail /
意向書' + 意向书 * * + letter of intent (LOI) (commerce)/
書' + 书 * * + book letter / document CL:本
書信' + 书信 * * + letter / epistle
書劄' + 书札 * * + letter / also written 書札|书札
書牘' + 书牍 * * + letter / wooden writing strips (arch.) general te
箋' + 笺 * * + letter / note-paper
緘' + 缄 * * + letters / to close to seal
聘書' + 聘书 * * + letter of appointment / contract
血書' + 血书 * * + letter written in one's own blood, expressing determination, hatred, last wishes e /
賀函' + 贺函 * * + letter of congratulations / greeting card (e.g. for New Year)
遠方來鴻' + 远方来鸿 * * + letter from afar (literary)/
音訊' + 音讯 * * + letters / mail news

FrameNet Data Release 1.6 by http://framenet.icsi.berkeley.edu licensed under a Creative Commons Attribution 3.0 Unported License

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Wordnet Translations:

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

[capital] capital letter, upper case
[mail carrier] mailman, postman, letter carrier
[correspondence] exchange of letters
[initial] first letter of a word
[letter] letter of the alphabet
[note] short letter, line, billet

Translations::

Copyright MultiWordNet 1.39

Copyright: 2005-2010 CWN group, Academia Sinica

WordNet 3.0 Copyright 2006 by Princeton University.

WOLF (Wordnet Libre du Français) Copyright: 2011 NICT

FinnWordNet Copyright 2012-2014 by the Department of Modern Languages, University of Helsinki.

GermaNet version 10.0: German part of the ILI

Multiwordnet Spanish Human Language Technology Group Copyright (c) 2014

Thai WordNet Copyright: 2011 NICT

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