Base Difficulty

Base difficulty: Level 274 edit

Level distribution for noun (concept_idea): 19: 2 26: 1 27: 1 221: 28 270: 30 274: 30 275: 28 280: 25 300: 1 360: 1 380: 2 1000: 1 1030: 1 1060: 5 1070: 6 1110: 4 1120: 4 1399: 66

Per-Language Difficulty Overrides

No difficulty overrides set. The base difficulty level will be used for all languages.

Add Difficulty Override
-1 to exclude, 1-1399 for level
Frequency and Tier Signals
Combined Frequency Rank: 1290 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr A2 (2 of 6) 2100

Rank used = synthetic rank this tier contributes to the combined frequency rank (lower = more common).

Corpus Frequency
Corpus Freq (per M) Best form Share Zipf rank Forms
19th_books 179.23 535 97% 551 downrated 1
20th_books 153.57 650 97% 670 downrated 1
wiki_math 111.00 1523 97% 957 2
wiki_geography 46.43 2849 97% 2934 downrated 1
wiki_biology 30.48 3905 97% 4022 downrated 1
wiki_modern_life 73.79 1945 97% 2003 downrated 1
wiki_arts 106.17 1844 97% 1288 2
wiki_society 139.76 1458 97% 1009 2
wiki_linguistics 56.87 3111 97% 1813 2
wiki_physical_science 29.97 3916 97% 4033 downrated 1
wiki_history 100.02 1292 97% 1331 downrated 1
early_modern_science 111.33 1005 97% 1035 downrated 1
religious_translated 92.65 1425 97% 1054 2
cooking 51.42 1708 97% 1759 downrated 1
legal_scotus 60.13 2281 97% 1752 2
eu_parliament_debates 385.25 351 97% 311 2
openstax_science 60.93 2118 97% 2182 downrated 1
openstax_society 142.07 1116 97% 952 2
wpa_life_histories 112.04 888 97% 915 downrated 1

Best form = the single best-ranked form in the corpus, share-blind — how the spelling itself ranked. Share = how much of that spelling belongs to this lemma, when several senses compete for it. Zipf rank = all the forms combined (variant spellings included), each scaled by its share, and what feeds the combined frequency rank. Combining forms improves on the best form, but a share below 100% pushes the other way and usually wins: a sense holding a small slice of a common spelling is a rare word, so its rank lands downrated below the best form — and once it falls past what the corpus can support it is capped at the rank an unlisted word would get.