Base Difficulty

Base difficulty: Level 221 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: 290 (weighted harmonic mean of corpus + tier signals; lower = more common)
Tier Signals
Source Tier Rank used
cefr A1 (1 of 6) 800

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 26.37 3147 100% 3147 1
20th_books 48.17 2084 100% 1666 2
wiki_math 692.93 334 100% 200 2
wiki_geography 209.20 1266 100% 659 2
wiki_biology 985.00 192 100% 107 2
wiki_modern_life 1435.42 115 100% 63 2
wiki_arts 549.41 344 100% 205 2
wiki_society 516.23 431 100% 221 2
wiki_linguistics 586.86 360 100% 221 2
wiki_physical_science 1181.75 147 100% 90 2
wiki_history 149.97 1377 100% 891 2
early_modern_science 117.32 1723 100% 967 2
religious_translated 0.00 — — — 0
cooking 0.00 — — — 0
legal_scotus 191.86 990 100% 665 2
eu_parliament_debates 179.02 973 100% 644 2
openstax_science 1324.51 149 100% 75 2
openstax_society 531.18 461 100% 250 2
wpa_life_histories 93.22 1214 100% 1007 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.