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: 505 (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 28.09 3833 100% 2580 2
20th_books 38.07 2782 100% 2019 2
wiki_math 214.81 870 100% 591 2
wiki_geography 389.32 575 100% 332 2
wiki_biology 556.36 293 100% 215 2
wiki_modern_life 554.33 287 100% 202 2
wiki_arts 330.04 779 100% 393 2
wiki_society 453.27 532 100% 269 2
wiki_linguistics 280.53 851 100% 471 2
wiki_physical_science 829.84 225 100% 147 2
wiki_history 410.71 475 100% 294 2
early_modern_science 163.26 1026 100% 702 2
religious_translated 175.56 820 100% 591 2
cooking 0.00 — — — 0
legal_scotus 176.88 1175 100% 723 2
eu_parliament_debates 173.92 1122 100% 667 2
openstax_science 555.66 321 100% 232 2
openstax_society 401.79 606 100% 351 2
wpa_life_histories 51.09 2137 100% 1643 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.