Each domain gathers the dictionary entries that Wiktionary attaches to that field, with their definition. Domains are listed from the largest to the smallest.
- Medicine 10,749
- Mathematics 10,257
- Chemistry 10,116
- Biology 9,272
- Engineering 9,098
- Business 6,342
- Computing 5,883
- Government 5,293
- Sports 5,167
- Politics 4,910
- Organic chemistry 4,057
- Transport 3,515
- Linguistics 3,299
- Media 3,279
- Games 3,248
- Geography 3,219
- Law 3,187
- Physics 3,177
- Entertainment 3,073
- War 2,895
- Military 2,894
- Geology 2,830
- Music 2,706
- Anatomy 2,354
- Philosophy 2,147
- Publishing 2,094
- Ball games 2,084
- Nautical 2,069
- Botany 2,041
- Zoology 1,947
- Microbiology 1,876
- Biochemistry 1,711
- Mineralogy 1,627
- Finance 1,494
- Literature 1,369
- Arts 1,296
- Pharmacology 1,273
- Religion 1,224
- Pathology 1,193
- Manufacturing 1,135
- Aerospace 1,131
- Astronomy 1,131
- Broadcasting 1,113
- Electrical engineering 1,081
- Christianity 1,062
- Grammar 1,052
- Psychology 1,028
- Aeronautics 975
- Aviation 901
- Architecture 894
- Television 889
- Video games 855
- Programming 841
- Economics 803
- Food 777
- Electromagnetism 757
- Geometry 757
- Energy 740
- Electricity 736
- Genetics 733
- History 711
- Railways 702
- Rail transport 676
- Film 659
- Communications 654
- Card games 643
- Mysticism 642
- Baseball 609
- Cricket 607
- Cooking 603
- Vehicles 570
- Automotive 557
- Education 548
- Phonology 534
- Martial arts 529
- Electronics 524
- Science fiction 515
- Construction 510
- Mining 508
- Inorganic chemistry 500
- Art 494
- Monarchy 487
- Nobility 484
- Heraldry 483
- Surgery 471
- Agriculture 468
- Logic 457
- Journalism 450
- Textiles 442
- Mythology 413
- Social science 410
- Climatology 403
- Statistics 397
- Printing 382
- Sexuality 374
- Meteorology 368
- Tools 365
- Weaponry 361
- Photography 357
- Entomology 353
- Soccer 350
- Sociology 340
- Marketing 334
- Neuroscience 332
- Board games 331
- Theater 327
- Poker 323
- Telecommunications 322
- Phonetics 316
- Typography 315
- Software 314
- Theology 309
- Racing 300
- Chess 299
- Neurology 291
- Football 290
- Algebra 289
- Writing 286
- American football 277
- Physiology 272
- Catholicism 258
- Computer graphics 256
- Firearms 254
- Mechanical engineering 250
- Crafts 248
- Wrestling 246
- Ecology 244
- Archaeology 234
- Fashion 233
- Pets 221
- Fishing 219
- Horses 216
- Fantasy 215
- Anthropology 214
- Psychiatry 214
- Science 214
- Taxonomy 213
- Computer 209
- Law enforcement 208
- Cytology 206
- Topology 204
- Basketball 203
- Immunology 200
- Graph theory 196
- Islam 196
- Metallurgy 196
- Computing theory 195
- Graphical user interface 193
- Cycling 187
- Accounting 186
- Golf 186
- Gambling 185
- Dentistry 184
- Ornithology 182
- Motor racing 174
- Fiction 173
- Paleontology 172
- Astrology 166
- Climbing 166
- Roman Catholicism 166
- BDSM 165
- Skating 164
- Poetry 162
- Mycology 160
- Pseudoscience 159
- Dancing 158
- Neuroanatomy 156
- Banking 155
- Networking 151
- Gaming 145
- Horticulture 144
- Rugby 144
- Ice hockey 141
- Radio 139
- Category theory 138
- Hunting 135
- Dance 131
- Horseracing 130
- Optics 130
- Set theory 130
- Databases 129
- Mathematical analysis 129
- Carpentry 128
- Beverages 125
- Horse racing 125
- Clothing 123
- Cryptography 122
- Surfing 119
- Skiing 116
- Tourism 114
- Bodybuilding 112
- Philately 112
- Astronautics 111
- Mechanical 108
- Bridge 105
- Fencing 105
- Electrical 104
- Sumo 104
- Tennis 104
- Insurance 100
- Road 100
- Travel 100
- Buddhism 98
- Snooker 98
- Boxing 97
- Computer hardware 97
- Mechanics 97
- Linear algebra 95
- Technology 95
- Gymnastics 94
- Numismatics 94
- Arithmetic 93
- Folklore 93
- Management 93
- Biblical 92
- Number theory 91
- Sewing 91
- Crystallography 90
- Commerce 89
- Astrophysics 88
- Advertising 87
- Lexicography 84
- Cartography 83
- Firefighting 83
- Semantics 82
- Billiards 80
- Criminology 80
- Ophthalmology 80
- Prosody 80
- Veterinary 80
- Oenology 79
- Wine 79
- Navy 78
- Zootomy 77
- Ideology 75
- Metalworking 75
- Dermatology 73
- Ethics 73
- Manner 73
- Professional wrestling 73
- Ichthyology 72
- Telephony 72
- Sex 71
- Cinematography 68
- Falconry 68
- Naval 68
- Roofing 68
- Alchemy 67
- Equestrianism 67
- Algebraic geometry 66
- Athletics 66
- Ecclesiastical 66
- Espionage 65
- Snowboarding 65
- Forestry 64
- Hydrology 64
- Signal processing 64
- Narratology 63
- Real estate 63
- Translation studies 63
- Weaving 63
- Cellular automata 61
- Parapsychology 61
- Curling 60
- Group theory 60
- Virology 60
- Weightlifting 60
- Cryptocurrency 58
- Political science 58
- Cardiology 57
- Comics 57
- Cryptocurrencies 57
- Skateboarding 57
- Property 56
- Embryology 54
- Surveying 54
- Cosmology 53
- Diving 53
- Masonry 53
- Performing arts 53
- Petrology 52
- Epidemiology 51
- Knitting 50
- Retail 50
- Rowing 50
- Ceramics 49
- Communication 49
- LGBT 49
- Probability theory 49
- Psychoanalysis 49
- Intellectual property 48
- Malacology 48
- Shipbuilding 48
- Woodworking 48
- Cosmetics 47
- Oceanography 47
- Oncology 47
- Technical 47
- Calculus 46
- Jewelry 46
- Bowling 45
- Game theory 45
- Birdwatching 44
- Furniture 44
- Paganism 44
- Thermodynamics 44
- Taxation 41
- Hematology 40
- Orthography 40
- Pool 40
- Sailing 40
- Underwater diving 40
- Drugs 39
- Glassblowing 39
- Pornography 39
- Brewing 38
- Archery 37
- Authorship 37
- Healthcare 37
- Phytopathology 37
- Acting 36
- Baking 35
- Juggling 35
- Lichenology 35
- Cartomancy 33
- Design 33
- Dramaturgy 33
- Geopolitics 33
- Machining 33
- Trading 33
- Civil engineering 32
- Drama 32
- Seismology 32
- Stock market 32
- Swimming 32
- Anime 31
- Computational 31
- Epistemology 31
- Exercise 31
- Metrology 31
- Sociolinguistics 31
- Audio 30
- Demoscene 30
- Order theory 30
- Shipping 30
- Toxicology 30
- Alternative medicine 29
- Information science 29
- Diplomacy 28
- Fluid dynamics 28
- Planetology 28
- Softball 28
- Backgammon 27
- Bacteriology 27
- Combinatorics 27
- Communism 27
- Ufology 27
- Emergency medicine 26
- Hip hop 26
- Obstetrics 26
- Time 26
- Volcanology 26
- Lacrosse 25
- Lutherie 25
- Patent law 25
- Beekeeping 24
- Manga 24
- Scientology 24
- Seduction community 24
- Space science 24
- Complex analysis 23
- Copyright 23
- Dice 23
- Endocrinology 23
- Fortifications 23
- Horology 23
- Linguistic morphology 23
- Morphology 23
- Protestantism 23
- Semiotics 23
- Wicca 23
- Motorcycling 22
- Plumbing 22
- Volleyball 22
- Bingo 21
- Bookbinding 21
- Freemasonry 21
- Radiology 21
- Trigonometry 21
- Comedy 20
- Egyptology 20
- Feminism 20
- Geomorphology 20
- Occult 20
- Palynology 20
- Petrochemistry 20
- Textual criticism 20
- Weather 20
- Web design 20