| 81 | Linguistics. |
| 81;1 | Linguistics–Philosophy |
| 81;39 |
| 81-112 | Historical linguistics |
| 81-115 | Comparative linguistics |
| 81-13 | Linguistics–Methodology |
| 81-23 | Languages, Modern |
| 81-24 | Extinct languages |
| 81-25 | Colloquial language |
| 81’0 | Language and languages–Origin |
| 81’01 | — language–Old — exp. English language–Old English |
| 81’02 |
| 81’04 | — language–Middle — exp. French language–Middle French |
| 81’06 | — language, Modern exp. French language, Modern |
| 81’1 | Linguistics. |
| 81`1(072) | — language–Handbooks, manuals, etc exp. English language–Handbooks,manuals,etc |
| 81`1(075) | — language–Handbooks, manuals, etc — language–Study and teaching |
| 81`1(075) | — language–Composition and exercises — language–Ability testing |
| 81`1(075.2) | — language–Study and teaching (Elementary) Alphabet books |
| 81’1(075.8) | — language–Study and teaching (Higher) English language–Study and teaching (Higher) |
| 81’1(09) | Linguistics–Historiography |
| 81’1:061.4(100) →81’1(063) | Linguistics–Congresses |
| 81’22 | Semiotics. |
| 81’221.2 | Sign language. Gesture. |
| 81’23 | Psycholinguistics |
| 81’24 |
| 81’242 | Native language |
| 81’243 | —language–Foreign speakers |
| 81’246 | Monolingualism. Bilingualism |
| 81’246.1 | Monolingualism |
| 81’246.2 | Bilingualism |
| 81’246.3 | Multilingualism |
| 81’25 | Translating and interpreting |
| 81’253 | Simultaneous interpreting |
| 81’255 |
| 81’255.2 | Literature–Translations Poetry–Translating |
| 81’255.4 | Translation–Style ??? |
| 81`27 | Sociolinguistics |
| 81’271.2 | Linguistic culture |
| 81’272 | Language policy |
| 81’276 | Slang — language–Slang exp. English language–Slang |
| 81’28 | Dialectology.Linguistic geography. — language–Dialects exp. English language–Dialects |
| 81’33 | Applied linguistics |
| 81’34 | Phonetics —language–Phonology exp.English language–Phonology — language–Phonetics exp. English language–Phonetics |
| 81’342 | Phonetics — language–Phonetics exp. English language–Phonetics |
| 81’35 | — language–Orthography and spelling exp. English language–Orthography and spelling — language–Graphemics exp. English language–Graphemics |
| 81’351 | — language–Alphabet exp. English language–Alphabet |
| 81’36 | Grammar, Comparative and general — language–Grammar exp. English language–Grammar |
| 81’362 | Grammar, Comparative |
| 81’366 | Grammar, Comparative and general—Morphology — language–Morphology exp.English language–Morphology — language–Word formation exp.English language–Word formation |
| 81’367 | Grammar, Comparative and general–Syntax |
| 81’367.3 | Grammar, Comparative and general–Sentences |
| 81’367.6 | — language–Parts of speech exp.English language–Parts of speech |
| 81’37 | Semantics — language–Semantics exp. English language–Semantics |
| 81’373 | Lexicology — language–Lexicology exp. English language–Lexicology |
| 81’373.2 | Onomastics |
| 81’373.21 | Toponymy. Names, Geographical. |
| 81’373.231 | Names, Personal |
| 81’373.4 | Word (Linguistics) |
| 81’373.42 | Synonyms.Antonyms.Homonyms — language–Synonyms and antonyms exp. English language–Synonyms and antonyms English language–Homonyms |
| 81’373.6 | — language–Etymology exp. English language–Etymology |
| 81’374 | Lexicography English language–Lexicography English language–Dictionaries |
| 81’374.2 |
| 81’374.221 |
| 81’374.3 |
| 81’374.4 |
| 81’374.5 |
| 81’374.8 |
| 81’374.81 |
| 81’374.82 |
| 81’374.822 |
| 81’374.823 | Dictionaries, Polyglot |
| 81’38 | Language and languages–Style |
| 811 | Languages. Languages, Artificial |
| 811.1/.8 |
| 811.1/.2 | Indo-European languages |
| 811.11 | Germanic languages |
| 811.111 | English language |
| 811.111(072) | English language–Handbooks,manuals,etc |
| 811.111(075) | English language–Handbooks,manuals,etc English language–Study and teaching |
| 811.111(075)->(076.5) | English language–Composition and exercises English language–Ability testing English language–Textbooks |
| 811.111(075.2) | English language–Study and teaching (Elementary) English language–Alphabet Alphabet books |
| 811.111(075.8) | English language–Study and teaching (Higher) |
| 811.111(082) | English language–Reading |
| 811.111(09) | English language–History |
| 811.111=025 | English language–Reading(Adoptations) |
| 811.111’01 | English language–Old English |
| 811.111’04 | English language–Middle English |
| 811.111’28 | English language–Dialects English language–Dialectology |
| 811.111’342 | English language–Phonetics |
| 811.111’35 | English language–Graphemics English language–Orthography and spelling |
| 811.111’36 | English language–Grammar |
| 811.111’362 | English language–Grammar, Comparative |
| 811.111’366 | English language–Morphology English language–Word formation |
| 811.111’367 | English language–Syntax |
| 811.111’367.3 | English language–Sentences |
| 811.111’367.6 | English language–Parts of speech |
| 811.111’37 | English language–Semantics |
| 811.111’373 | English language–Lexicology |
| 811.111’373.2 | English language–Etymology–Names |
| 811.111’373.21 | Names, Geographical–English |
| 811.111’373.231 | Names, Personal–English |
| 811.111’373.42 | English language–Synonyms and antonyms English language–Homonyms English language–Archaisms |
| 811.111’373.6 | English language–Etymology |
| 811.111’374 | English language–Lexicography |
| 811.111’374.8 | English language–Dictionaries |
| 811.111’374.8=161.1 | English language–Dictionaries–Russian |
| 811.111’374= |
| 811.112.2 | German language |
| 811.112.28 | Yiddish language |
| 811.112.5 | Dutch language |
| 811.112.6 | Afrikaans language |
| 811.113.3 | Icelandic language |
| 811.113.4 | Danish language |
| 811.113.5 | Norwegian language |
| 811.113.6 | Swedish language |
| 811.124 | Latin language |
| 811.124’01 | Old Latin ??? Latin language, Preclassical to ca. 100 B.C. Latin language, Vulgar. |
| 811.124’02 | Classical Latin |
| 811.124’04 | Mediaeval Latin Latin language, Medieval and modern ??? |
| 811.124’06 | Modern Latin Latin language–Spoken Latin.??? |
| 811.13 | Romance languages |
| 811.131.1 | Italian language |
| 811.133.1 | French language |
| 811.134.2 | Spanish language |
| 811.134.3 | Portuguese language |
| 811.135.1 | Romanian language |
| 811.135.2 | Moldovan language (see also Romanian language) |
| 811.14 | Greek language |
| 811.14’02 | Greek language, Hellenistic (300 B.C.-600 A.D.) |
| 811.14’03 | Greek language, Biblical |
| 811.14’04 | Greek language, Medieval and late |
| 811.14’06 | Greek language, Modern |
| 811.152.1 | Irish language |
| 811.152.2 | Scottish Gaelic language |
| 811.16 | Slavic languages |
| 811.161 |
| 811.161.1 | Russian language |
| 811.161.2 | Ukrainian language |
| 811.161.3 | Belarusian language |
| 811.162 |
| 811.162.1 | Polish language |
| 811.162.2 | Polabian language |
| 811.162.3 | Czech language |
| 811.162.4 | Slovak language |
| 811.163 |
| 811.163.1 | Church Slavic language |
| 811.163.2 | Bulgarian language |
| 811.163.3 | Macedonian language |
| 811.163.4 |
| 811.163.41 | Serbian language |
| 811.163.42 | Croatian language |
| 811.163.6 | Slovenian language |
| 811.17 | Baltic languages |
| 811.172 | Lithuanian language |
| 811.174 | Latvian language |
| 811.18 | Albanian language |
| 811.19 | Armenian language |
| 811.21/22 | Indo-Iranian languages |
| 811.21 |
| 811.211 | Sanskrit language |
| 811.211’01 | Vedic language |
| 811.212 | Pali language |
| 811.213 | Prakrit languages |
| 811.214 | Indo-Aryan languages, Modern |
| 811.214.21 | Hindi language |
| 811.214.22 | Urdu language |
| 811.214.27 | Panjabi language |
| 811.214.32 | Bengali language |
| 811.214.58 | Romani language |
| 811.22 | Iranian languages |
| 811.221.18 | Ossetic language |
| 811.221.31 | Pushto language |
| 811.222.1 | Persian language |
| 811.222.1’01 | Avestan language |
| 811.222.1’02 | Old Persian language |
| 811.222.1’04 | Pahlavi language |
| 811.222.1’06 |
| 811.222.5 | Kurdish language |
| 811.222.8 | Tajik language |
| 811.293 | Macedonian language |
| 811.341.1 | Sumerian language |
| 811.341.4 | Hittite language |
| 811.341.6 | Urartian language |
| 811.35 | Caucasian languages |
| 811.351 |
| 811.351.12 | Avaric language |
| 811.351.21 | Lak language (Russia) |
| 811.351.22 | Dargwa language |
| 811.351.32 | Lezgian language |
| 811.351.41 | Bats language |
| 811.351.42 | Chechen language |
| 811.351.43 | Ingush language |
| 811.352 |
| 811.352.1 | Abazin language |
| 811.352.2 | Abkhaz language |
| 811.352.3 | Adygei language |
| 811.353 |
| 811.353.1 | Georgian language |
| 811.353.2 | Svan language |
| 811.353.31 | Laz language |
| 811.41 | Afroasiatic languages |
| 811.411 | Semitic languages |
| 811.411.1 |
| 811.411.11 | Akkadian languages |
| 811.411.111 |
| 811.411.112 | Suret language??? –>811.411.172.3`06 ((Assiryan) |
| 811.411.152 | Phoenician language |
| 811.411.16 | Hebrew language |
| 811.411.17 | Aramaic language |
| 811.411.172.3 | Syriac language |
| 811.411.172.3’06 | Syriac language, Modern ??? (Assiryan) |
| 811.411.21 | Arabic language |
| 811.411.41 | Amharic language |
| 811.412 | Egyptian language |
| 811.412’09 | Coptic language |
| 811.51 |
| 811.511.111 | Finnish language |
| 811.511.113 | Estonian language |
| 811.511.131 | Udmurt language |
| 811.511.132 | Komi language |
| 811.511.14 | Ugric languages |
| 811.511.141 | Hungarian language |
| 811.511.14 | Khanty language(Ostyak language) |
| 811.512 | Altaic languages |
| 811.512.1 | Turkic languages |
| 811.512.111 | Chuvash language |
| 811.512.121 | Karakalpak language |
| 811.512.122 | Kazakh language |
| 811.512.123 | Nogai language |
| 811.512.133 | Uzbek language |
| 811.512.141 | Bashkir language |
| 811.512.142 | Karachay-Balkar language |
| 811.512.145 | Tatar language |
| 811.512.154 | Kyrgyz language |
| 811.512.157 | Yakut language |
| 811.512.161 | Turkish language |
| 811.512.162 | Azerbaijani language |
| 811.512.164 | Turkmen language |
| 811.512.31 | Buriat language |
| 811.512.37 | Kalmyk language |
| 811.521 | Japanese language |
| 811.531 | Korean language |
| 811.581 | Chinese language |
| 811.584.6 | Tibetan language |
| 811.6 |
| 811.612.4 | Khmer language |
| 811.612.91 | Vietnamese language |
| 811.9 | Languages, Artificial |
| 811.921 | Volapük |
| 811.922 | Esperanto language |
