Base Difficulty

Base difficulty: Level 270 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: 911 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
basic_english Basic (1 of 2) 600
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 59.07 2558 100% 1441 2
20th_books 65.63 2039 100% 1278 2
wiki_math 47.35 2111 100% 2111 1
wiki_geography 115.86 1191 100% 1191 1
wiki_biology 173.91 1007 100% 792 2
wiki_modern_life 297.78 442 100% 400 2
wiki_arts 232.91 791 100% 567 2
wiki_society 209.21 890 100% 646 2
wiki_linguistics 153.70 1191 100% 822 2
wiki_physical_science 111.70 1308 100% 1308 1
wiki_history 92.52 2203 100% 1451 2
early_modern_science 115.42 1960 100% 991 2
religious_translated 140.14 905 100% 718 2
cooking 163.39 926 100% 661 2
legal_scotus 87.84 1625 100% 1334 2
eu_parliament_debates 282.07 437 100% 437 1
openstax_science 90.19 1532 100% 1532 1
openstax_society 198.83 857 100% 697 2
wpa_life_histories 25.54 4221 100% 2762 2

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.